You know, if you didn't know better... He could really almost seem...

But he's as dangerous as the rest of them together. With Auror Lestrange, you know she'd kill you in an instant and like it. With him, you never quite know. I mean, he might, but he might not, and then there's the thing that tells you he wouldn't want to if he did decide to kill you.

In the end it doesn't matter that he wouldn't want to, but somehow it makes it harder to stay on guard with him. It shouldn't, but it does.