But to me, it did look like the guy for USM jabbed at his head with his elbow, which I thought was a little dirty. I think the catcher reacted the way he did as well as the pitcher because of the elbow job. I don't know if it was intentional or not. To me, it looked intentional.
Still, both guys should have been ejected.
As far as the runner, I guess he should have slid. He still would have been out by a mile no matter what he did. At least by sliding you make the catcher go down and you don't have something happen on accident or otherwise like that by going in standing up.
I know what the rule says, but if common sense prevailed the world of college baseball, the runner would have been called out and both benches would have been warned. The only reason the umpire kicked the USM guy out was because of how the rule is written.