I mean, it'd be weird to put it on his face. It's like --

[She frowns and makes a little tutting noise as she thinks how to explain.]

It's a promise that I'll protect -- him. You. Anyone I put it on. But it's also, like...advertisement. Like a claim; you don't protect anyone you don't see as being yours, you get it? So if I stuck a big Mark on your face I'd be saying that's the first thing I want anyone to know about you.

I mean, if you want my Mark on your face....