Well, if you wanted to get his attention, that's the way to do it. Ignatius's eyes widen, a kind of longing in his body and soul that he can't imagine these mortals understanding. He wants to try to snatch the thing the second he sees it, but his fists merely clench as he acknowledges that there is no way it's that simple, and that he's still at their mercy.

The thing he feels most in this moment is frustration, because he doesn't know where this conversation is going. All he knows it's that they are showing off his Heart like that, they probably want something big from him. Some kind of lasting deal that will ensure that he's still not free. He has no particularly rational reason to think that, but it's on his mind regardless.

So, instead of looking relieved, he inclines his head a little, like someone who is waiting to get slapped.

But... That's not really what happens.

Instead he looks completely taken off guard, looking at Childermass like he doesn't really believe it. It goes against everything a Fae is raised to understand, that they would give this to him with no assurances and without even asking for anything in return. He can't believe they'd agree to that, or that Rita would either.

It means he reacts to the offering in a way that is almost youthful in it's complete uncertainty and bashfulness. He doesn't have any idea what to say, so he tentatively holds out his hand to take the egg, like he's still expecting they will change their mind at the last second.