He's decently powerful, it's basically all he's been studying for the last... lots of years.
They aren't universal, that one is specific for the building, but he didn't spend much time on it so it won't stay for long (I noted it would be an hour. I don't wanna be too OP). I figured that the building would see itself as a single entity, and since the attack was yesterday all he'd have to do is rewrite it so the attacker went to a different building instead of this one.