Dave's spokesperson, Carla Sims, tells TMZ ... immediately after the attack, D.C. went directly back to standup mode, grabbing the mic and celebrating the beatdown ... saying Busta was helping stomp on the 23-year-old who was armed with a replica gun and real knife.
Dave also called Jamie out on the stage and thanked him for participating.
And, at the after-party, Dave told the crowd ... you know you've crossed the line when Jon Stewart gets a few licks in of his own.
Well, now Sims is telling us Dave's comments were simply part of his ever-evolving act ... in that none of the 3 guys threw a punch or otherwise participated in the takedown.
Now Jamie, Jon and Busta probably appreciate the clarification ... it's unclear if the attacker may lawyer up, claiming he was the victim of excessive force by people on the stage, so clearing things up would protect them from possible legal action.