The clatter of the tape measure striking the wall does make Alphonse startle and look around, but he's not particularly worried. For Wrath that's pretty tame, even taking into consideration he can't throw engines around right now. It's a little encouraging, but Al knows better than to get his hopes up.

"Wrath? Where are--oh, there you are." Al maintains a calm expression and doesn't approach his hiding spot just yet. "I have some food for you. You must be hungry by now, right?"