Thanks. I had to see it to believe it.
The whole exchange is worth watching, although there isn't anything new in it. The Trump supporter said, in response to the "Trump tells his supporters to punch opponents" that Cruz was lying. Cruz went on and argued "the facts," what Trump said in that rally where an agitator threw a tomato, and said that was proof for the general assertion. same pattern of "you lie," "no I don't, here's the evidence" on a few other issues. I don't know if there is a transcript of the entire 7 or so minutes, and just got lucky on finding the piece you were looking for.