I lifted this from elsewhere, and they lifted it from Reddit, who lifted it from the Wrestling Observer, so it’s hot potatoes and probably half fucking wrong… but apparently a third party that witnessed it says Punk started it, then he went at Tony.

"Another version, and this would be a neutral source who was not a wrestler but was there and witnessed it and his version was that right after Perry came to the back, Punk went nose-to-nose with him aggressively and asked him if he had a problem. That person said Perry said he was just looking to get heat as a heel. Punk shoved him hard, Perry got in his face and in that version Punk sucker punched him and went for a choke. People immediately broke it up and Khan was yelling at Punk to let him go.

That person said that once they were separated, Punk lunged in Khan’s direction but a number of people got in his way while Punk was yelling “I Quit.” Monitors were knocked down during all this. Joe was very upset and went to calm Punk down."