Let me make this clear to you, mate. You don't know what you're messing with, so Back. Down.

[For his part, he doesn't seem all that bothered. After all, his greatest enemy holds power over fear itself, a human, even one with magic, isn't much of a threat to him at all] You really want to push it, don't you dog boy?

[This, however, does give him reason to pause. Because, well, if there was one weak spot for the pooka, children were it. Another kid from another world he couldn't reach. Another one growing up without a guardian. It wasn't right]

Trust me, if I was part of your world, he would have been protected. We wouldn't have let that happen to him. [And that, at least, is sincere]

He doesn't hurt the kids, I won't have any reason to hurt him. I'm not looking for a fight. Which doesn't seem to be the same for you. I care about the kids here. Nothing more, nothing less. If he doesn't give me a reason to fight him, I won't. But I will defend those children with my life. I swore an oath, the kind you can't go back on.

[He casts Sirius a disdainful look] No matter who takes issue with that.