There are way weirder ones.

[ he will agree with that sentiment. he's looking at you, tiny rooster.

but.
all joking levity in the face of real, actual danger aside?
he's going to give Waver the most serious expression he'd ever fixed the man with. In his life. ]

I promise you, with every bone in my body.
If you fall asleep or turn back to your normal self and fall asleep.

I won't let anything happen to you.
I'll protect you, with every fiber of my being.
You have my word.