It's hard to describe because I don't know what's going on. But There's a guy jacking off in the bathroom and a girl trying to hold the door shut, when some other guy comes in and says something. It's just fucking weird.
i've actually seen this video in it's entirety, and what happens before what you saw kind of explains it..... the two were having sex, with the girl leaned up against the door, and someone starts banging on it cause they 'have to go'.... at first they ignore the dude then i guess somehow the door came unlatched, cause it pops open and the guy doing the fucking turns away.... apparently he was too close to stop, cause he finshes himself off while the chick tries to keep the guy outside at bay.....
the only wierd thing is that they were filming it :S 95% of people are so damn stupid, there is no point in wonering what-were-they-thinking