Th kid can be heard on one video saying “I just killed someone” on his phone just before fleeing the mob. The guy with the headshot appears to be someone from an earlier video who is both verbally and physically antagonistic, literally challenging someone else to shoot him.
I listened to video a couple times and couldn’t tell what he said. Some have reported he said “I just killed somenone” and others have reported he said “ I didn’t shoot him”