BOULDER — Old wounds heal, eventually. But for CU Buffs center Tim Lynott, the abuse that teammate Jacob Callier took from Nebraska fans over the last 12 months on social media didn’t just leave a bad taste. It left a scar.

“When you’re in that game, you just make mistakes, sometimes,” said Lynott, who started at right guard for the Buffs during CU’s 33-28 win over the Cornhuskers last Sept. 8 in Lincoln. “I do, sometimes, too. It’s all adrenaline at that point … you don’t know what you’re doing, sometimes …”

@kingcallier: Nebraska says hello. We are all watching you to make sure you don’t commit an assault on the field again

“So I think that, if people would actually be in that place — which is a lot of them, the majority, they’ll never know what it’s like,” Lynott said. “So for them, they can keep their mouths shut on social media and everything, unless they want to say it to someone’s face. Which I know they’re not going to.”

Is your cheap (expletive) dirty player @kingcallier playing Saturday? #WANTED

“Honestly, for my part, they’re cowards for that,” Lynott said. “That’s just my own take on it. But they’ve never been in that situation, so I don’t expect them to know what they’re talking about. They can talk about whatever they want, so, let them do it.”

@kingcallier: You think we forgot?

They haven’t. At all.

As the Huskers return to Boulder on Saturday for the first time since 2009, the most unpleasant part of CU’s victory last season has reared its ugly head again: The fallout from the tackle Callier, the Buffs’ sophomore outside linebacker, made on Nebraska quarterback Adrian Martinez at Memorial Stadium with 3:29 left in a 1-point game.

The play’s been run back and forth more times than the Zapruder film, especially in Big Red circles: With the Huskers leading last September’s meeting 28-27, Martinez keeps on an option read to his right, and holy heck breaks loose.

Callier slides under the traffic and catches the nimble signal-caller by his right ankle and hangs on for dear life as CU teammates Israel Anwtine, Nate Landman and Javier Edwards close in. In slow motion, it’s apparent Callier — as Martinez is sandwiched above by a pile of CU and Nebraska players — rolls his right shoulder toward the turf, the way a wrestler does on a mat, all while maintaining control of the quarterback’s leg. Martinez was forced to leave the contest with a knee injury after throwing for 187 yards and rushing for 117 more.

Big Red fans were furious as the Huskers’ offense stalled and CU rallied. Nebraska coach Scott Frost cried foul, submitting a video of the play for review to both the Big Ten and Pac-12 offices, but then-Buffs coach Mike MacIntyre announced the Monday after, following discussions with CU and league officials, that no suspensions would be levied.

Last Sept. 13, Callier posted the same message on his Twitter and Instagram feeds with a picture of him celebrating at Memorial Stadium with teammate Nu’umotu Falo Jr.:

I know they hatin on me … But (I don’t) read comments …

His teammates, friends and Buffs administrators clearly did. All parties in recent weeks have made a point of trying to move on, even if some in their respective fan bases won’t. Or can’t.

CU declined multiple interview requests to talk with Callier, who didn’t play in the Buffs’ 52-31 season-opening victory over the CSU Rams and is listed as a second-team outside linebacker on the depth chart.

“He wasn’t upset about it. He was just like, ‘Wow, this is getting out of hand, it’s ridiculous,’” Lynott said of Callier. “And I thought the same thing.”

Martinez has moved on, too, deflecting questions politely on the topic during a news conference Monday in Lincoln, noting that “injuries are a part of the game, and it is what it is.”

And it stings. Still. George Petrissans, Martinez’s prep coach at Fresno (Calif.) Clovis West, said the Big Red takeaway hasn’t changed:

“I thought it was a dirty play. Is there really any other way to see that play?

“Unfortunately, he got hurt on that. But you know, that’s the way sometimes that game is. Adrian had to do what he had to do — he had to sit out, obviously. But he came back.

“I’m sure his mindset is to be prepared for everything in this game. I’m sure that was a little bit of an awakening for him.”

For everybody, in hindsight. When asked about Huskers fans on social media, CU linebacker Nate Landman cracked that he’s “not a big Twitter guy,” although if you’ve got a smart phone, there’s nowhere to hide once you’re pinged by somebody, somewhere, from either side. Whether you like it or not.

“For me, I just sit back and laugh at it,” Landman said. “If they’re worried about us in that way, then they’re worried about us in that way. We just want to play football.”

And Landman confirmed what a lot of neighbors say of Nebraskans: As long as the conversation doesn’t involve the Big Red, they’re among the most affable folks to walk the Earth.

“I’ve had people who went to the game (in Lincoln) last year, and they said they had the nicest fan base in Nebraska, too,” Landman said. “So it’s not everybody.”

Although it only takes a few to make a lot of noise, for one retweet to become gospel. To leave a mark.

“It’s just one of those things where it’s a life lesson in general: Don’t listen to people on the outside,” Lynott said. “If they’re going to hide behind their screens and not say it to (someone’s) face, don’t listen to them.”

Especially this week. Or, come to think of it, the next.