Help U.S. identify the gentleman in the black shirt standing beside CHARLIE KIRK possibly giving the ASSASSIN the SIGNAL to SHOOT!

Help U.S. identify the gentleman in this video making the unnatural arm gestures in the black shirt standing beside CHARLIE KIRK. He appears to be giving the ASSASSIN the SIGNAL to SHOOT KIRK! LINK: https://x.com/i/status/1965914419369558495