User blog comment:Theory of everything/Is Nick loosing his Grimm powers?/@comment-2255188-20120205180216

There seems to be a pattern, actually-- he only sees who they are when they feel exposed. Even in the case of Bud, he didn't reveal his Eisbiber form until someone mentioned he'd been working on the fridge all day. However...I'll note that the first episode is a bit contradictory to that, with the exception of the postal worker. Or perhaps he only sees who they are when the producer wants us to know who they are. :D