For a moment she blinks in confusion at his answer. She'd simply assumed he had constructed his human form, like she had, but apparently he'd... what, possessed it? The bloodied feathers falling to the ground quickly remind her that there's no time to worry about that now, though.

She's also not sure what Grace is, but it's clear it must be something like the raw force of his being, and that does give her a better idea of what they're trying to achieve. She knows how to contain things, she contains an infinity herself, and she shares that knowledge as wordless reassurance.

Her idea of offering her own mind as at least partial containment for his power is interrupted by the force of his momentary grief, and his fear makes her tremble as well, nearly pushing him away with the sudden terror of what would happen to her if they failed at containing him. Against a flash of panic she tells herself he isn't antitime, isn't inside her actual structures, and isn't going to erupt. Then, with a deep breath, she extends herself as far as she can while being sure she'll be able to maintain this for some time, and enforces his containment like a secondary wall.