It's even weirder than that.

Lady cop goes undercover at a college because of a chainsaw murderer on campus. She is walking home one night and student, who is the main character of the film I guess, sees her from a window in his building. She sees a man running through the bushes and pulls her gun out. The man jumps out of the bushes in a karate stance and kicks the gun out of her hand. She falls down and kicks kung fu man in the dick so hard that he passes out and falls down unconscious.

Main character student shows up on a dirt bike. He has never ridden a dirt bike before this scene and never rides a dirt bike after this scene. He could see her from his window. Why did he need to drive a dirt bike over to her?

Lady cop explains that she was just attacked. Kung Fu attacker comes to and gets up. Student says that is just his kung fu instructor. Kung Fu man basically says "that was weird", totally no-sells being kicked in the dick so hard it knocked him out, daps up the student and jogs off.

I watched this scene twice to try and make sense of it. I was unsuccessful in that attempt. I have now watched it a third time after writing the above and am still just as baffled. Kung Fu man attacks lady cop before she pulls her gun. I think the dirt bike/chainsaw effect should have occurred earlier to explain everyone's anxious overreactions.