For a moment, he thinks of crazy, ridiculous plans of how to get inside. Things like "piss off Ironhide enough and trick him to break down the door" was a little extreme, but he seriously considered the possibility of having to climb up the outside and come in through the window.

Fortunately, he doesn't have to do any of that when he hears the lock disengage and Krok is opening the door.

"Oh." Fulcrum rubs the back of his neck. "Sorry for waking you, then," he says, not immediately suspecting anything. "Can I come in?"