It looks like it's on their security camera, though she may have set him up in front of it, it may have just been opportunistically caught. It's not really too surprising because Crowder has rarely reacted well to pushback from anyone, which is probably why he prefers soft targets.
For james (who's been posting it in Culture War) and Himu, we've been "discussing" it some in the Wank Dad thread, Transhuman did a good analysis of Crowder's "statement" there. I don't know where we should want to organize our Crowder posting to.