Stumble? Are they that biased?
The guy tried to physically stop him and challenge him for his press credentials (because he obviously was asking questions he didn't want asked) and in the process pushed him into a barricade that caused him to fall. Once up, he still continued to try to halt him from getting near the candidate and challenged him for credentials. He was clearly trying to harass and impede the reporter, don't think he intended to knock him down, but still that wasn't a stumble.
This was no damned stumble, and for a paper to report it as such is flat out propaganda.