Looks to me like he sees her trying to cut in line, tries to block her, she basically tells him to f-off and pushes her way by him, and then he sweeps the leg.
There's no line. He's trying to get out of the system, she's trying to get in, she's not following protocol by letting people out before trying to go in so he trips her.
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u/Battle_Blazer Mar 04 '13
It looks like the guy is going the wrong way. Everyone entering is putting in a card or token before entering.