[Well. Good to know that he's made that much progress. Billy glances down, holding the package in one hand while he turns the other this way and that, cautiously reaching inwardly with his own magic to feel for exactly what Loki had done. He can't recall ever having a spell cast on him before, so he's fascinated by the experience rather than being angry like he probably should be.]

A ward... what's it do? And what happened to get you so worried?

[Belatedly, he realizes another thing-]

...You realize you basically just admitted that you're worried about me, right?