Spencer Platt via Getty Images Police and FBI members search around the scene of a bombing in the Chelsea neighborhood of Manhattan on September 19, 2016 in New York City.

During the hours between a Saturday night explosion in Manhattan that left 29 people injured and the arrest of 28-year-old suspect Ahmad Khan Rahami in Linden, New Jersey, late Monday morning, New Yorkers seemed remarkably unruffled.

“It was only a matter of time,” Graham Mills, who lives near the site of the 23rd Street explosion, told The New York Times. “There’s kind of this New York spirit that’s like, ‘Whatever. Let’s get on with life.’”

Of course, others seemed rattled. “The whole city looks different to me,” Kyle Li, the father of a 3-year-old and who lives across the street from the explosion, told the Times.

According to the U.S. Centers for Disease Control and Prevention, people who are closely exposed to trauma are at a greater risk for negative effects, such as post-traumatic stress disorder, depression and generalized anxiety.

In the aftermath of the explosions in New York and New Jersey, however, New Yorkers defied the rule of proximity to terror ― at least on Twitter ― by joking about city residents’ stoic respondence to the bombing:

The world freaks out while New Yorkers push on and get a coffee and a bagel — Colin Jones (@colinjones) September 18, 2016

This subgroup of hard-nosed New Yorkers may be experiencing a form of resilience in the face of trauma, or what’s known as post-traumatic growth. After Hurricane Katrina, for example, 30 percent of survivors felt the storm had made them stronger, or enhanced their relationships or spirituality, according to a 2013 study of low-income mothers in the years following the storm.

“It’s making positive meaning out of the traumatic experience,” said Adam Gonzalez, assistant psychiatry professor at the Stony Brook University School of Medicine.

That’s not to diminish the experience of people who are anxious about the bombings. Individuals with psychological disorders or with a history of trauma could have those fears reignited, according to Gonzalez.

A lot comes down to perspective: If you already think New York is dangerous, an act of violence could solidify your opinion. If you think New York is relatively safe, you’re more likely to continue to enjoy your life with a renewed awareness of your surroundings.

People who are far away could still be affected

For those outside of New York City ― some of whom posted prayers for New Yorkers on social media and commented about how scary the situation was ― the Chelsea explosion is a reminder that terrorist attacks can happen on U.S. soil.

“The United States becomes quite small when something like this happens. We all have relatives or friends or some connection,” said Dr. Michelle Riba, a clinical professor of psychiatry at the University of Michigan Health System.

One reason that people living far away from an incident may be affected is the media: Wall-to-wall coverage after terror attacks can make it seem like attacks in the West are common, when in reality, they are relatively rare.

“We saw this after 9/11 happened,” Gonzalez said, citing longer-term PTSD symptoms even in people who weren’t directly exposed to the attacks. “One of the big pieces of that was because of the media’s coverage of it.”

In general, Gonzalez sees to New Yorkers’ fearlessness as a good thing for the city, provided it doesn’t come at the expense of minimizing anyone’s anxiety.

“Those who are in distress ought to seek help and family members and friends should try to provide support to those people,” he said. “As a whole, coming together as a community and responding with strength versus fear is really the most ideal way to grow from this situation.”

Resilient New Yorkers who are doing their part to keep our collective stress level low:

People calling into NY1 who were on the block when the explosion happened? Full NYC calm. "I heard the explosion, then went to the deli." — Jim McCarthy (@JimMcCarthy528) September 18, 2016

New Yorkers seem pretty quiet and calm this morning. Moms of New Yorkers, probably not so much. — Will Federman (@wfederman) September 19, 2016

Trying to steal someone's belongings and disabling a bomb in the process is New York values af — Comfortably Smug (@ComfortablySmug) September 19, 2016

inspiring: the first thing new yorkers did after the explosion in chelsea was call loved ones to say "actually, 23rd and 6th isnt chelsea" — Max Read (@max_read) September 18, 2016

Sending out an emergency alert to people's phones before 8 am is a form of terrorism. — Jess Dweck (@TheDweck) September 19, 2016

No one in the NYC area as freaked out by an explosion as everyone not remotely close to the city... take it down a notch, planet Earth. — The Villain's Story (@GeekFurious) September 18, 2016

Very proud and grateful to NYPD and NJPD, and glad we all stayed level-headed! The absolute best side of NYC shone thru today. — Chiara Atik (@ChiaraAtik) September 19, 2016

The rest of America freaking out about terrorism while NYC stays calm is pretty much how New Yorkers have experienced the last 15 years. — Brooklyn Spoke (@BrooklynSpoke) September 18, 2016

Gotta say, I've been really impressed with New Yorkers' phlegmatic approach to the whole bomb thing. Unflappable. — Robin Wigglesworth (@RobinWigg) September 19, 2016

Me: There was an explosion in NYC but I'm ok

Mom: Omg were u near it?

Me: Sort of

Mom: R u home now?

Me: No we went out for noodles

Mom: 😒 — Sarah Peele (@sarriepeele) September 18, 2016

It's heartwarming that in the wake of the Chelsea explosion New Yorkers have come together to agree that Chelsea isn't trendy. — Kashana (@kashanacauley) September 18, 2016

Man, New Yorkers sure are pleasant on a morning commute when it's pouring and we all just got a bombing suspect alert — Dan Saltzstein (@dansaltzstein) September 19, 2016

New York fears ranked

1. Pushed into subway tracks

2. Seamless outage

3. Have to go to Times Square

4. Fav dive bar gentrified

1,563: ISIS — Bobby Big Wheel (@BobbyBigWheel) September 19, 2016