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It was an act of kindness that set off a tremor in the heart of Seattle Seahawks’ Richard Sherman.

After seeing that a Seattle fan gave his Sherman jersey to a 13-year-old Green Bay Packers fan during the Seahawks wild comeback win on Sunday at CenturyLink Field — where rejoicing fans are known to celebrate so raucously it once generated seismic activity equal to a small earthquake — the star cornerback announced he would be sending the generous fan a signed jersey and other tokens of his respect.

"Great story of a true 12. Signed jersey coming his way," Sherman wrote on Twitter Wednesday, referring to the "12th man," a term used to describe a football team’s fans in the stands.

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Seattle fan PJ LeDorze gave his Sherman jersey to 13-year-old Austin after the boy and his father, Tim McElravy, both die-hard Packers fans, were in the stands surrounded by jubilant Seahawks fans after Seattle beat Green Bay 28-22 to advance to the Super Bowl, NBC station KING 5 reported.

"At the end of the game my son congratulated him on a great game and PJ took off his Sherman Super Bowl Jersey and GAVE it to my son. We were moved to tears," Tim McElravy wrote to the station in a bid to connect with LeDorze.

LeDorze told NBC News that Sherman’s people reached out to him Tuesday with the offer of a swag bag of fan gear. The 35-year-old corporate recruiter for Amazon, who rides horses competitively in his spare time, described himself as "just an average guy" but said he was overwhelmed by the attention his act has received.

He was at the game with his cousin, who has two season tickets, and had been chatting up the McElravys throughout the game. When Austin gave him a hug after the win, "it really moved me," LeDorze said.

"I had no idea it would touch anybody … that this would touch a lot of people," LeDorze said. "I like to think I can come up with some pretty wild dreams, but this is beyond anything I could have imagined." LeDorze plans on keeping the new jersey "for life."

SOCIAL

12s, thanks for helping track down PJ. Great story of a true 12. Signed jersey coming his way http://t.co/AWBrARigCE pic.twitter.com/zZIl1InhhG — Richard Sherman (@RSherman_25) January 21, 2015

— Phil Helsel