The way that shot looks to me is that they are implying that Zod abruptly looked down so that it was no longer coming out the side of the building, since it was likely going directly down to the ground through all the floors. Of course, with the two images super-imposed like that we can see he didn't look down enough for that, or fast enough for it to "jump" without any continuous beam, but if you aren't an internet detective you'd never know, and it also conveniently allows Bruce Wayne to escape being vaporized. Overall I'm fairly impressed by the shot still.