Well, if you don't mind mild spoilers (and we don't know whether or not this is really true):
Batman was chasing criminals or escaping (something like that) and Superman came out of nowhere and Batman didn't see him until the last seconds (that is why he's braking as you see in the previous spot). Dunno if this is all true or not, but it was something along those lines.
Alright, that I like. Changes the scene quite a bit.