Of all the things that could draw Tony's attention, the chest is possibly the least anxiety-inducing option. Merciful, for Ellis, whose attention is split between their group moving around the chamber and the inescapable pressure dragging at the edges of his mind.

"Can it open?" Ellis asks in return, moving along in his wake.

Even existing in this chamber is impossible. It's Ellis' instinct to put himself between the most dangerous thing in the room and Tony. But there's no way to do that without interfering in Tony's work, and Ellis is harboring some quiet resentment over it.

The sooner they can accomplish what they came here to do, the better. (It occurs to him he will have to try and explain what he can feel in this room to Tony, but maybe not until they're on the way back to Kirkwall.)