Yikes.

[He whistles low under his breath.]

Okay, the good news is it's probably not as bad as it looks. Yeah, there's a lot of blood, but you did good getting pressure on it and once we clean it up it won't look nearly as messy. If you're lucky you won't even need stitches.

[He gets an arm around Hiccup, mostly to steady him.]

C'mon, into the lab. The sooner we get that disinfected and bandaged, the better you'll feel.