I have no idea, the whole thing just felt really fake, staged, contrived, whatever. They said a real guy in the audience died, etc. but it just has the Columbine feel to it.
Trump could have done the pro wrestler razor blade trick for all I know (where a wrestler carries a small blade and cuts himself at the exact time the other wrestler throws him against a pole or the ground).
I'm sure there are a million reasons why that's "not what happened" but I can't shake the fake and gay sense.