Well, considering she can heal, broken bones won't do much to stop her... but this would:

[youtube]HSEcYfdaaC8[/youtube]

Minus the whole "turn into blood" thing, because as fucking badass as that is, it's not something Steve can do. Unless he mutates further... which if it does happen wouldn't happen for a long while. But Vein would probably pull that cutting bit on a healer, since he lusts for blood... Slicey, Slicey!