I suppose Rudy would say I should have foreseen trouble with Sam Fawcett. And he'd probably be right.

I've got his wand. There's really no rush to get you here. I was thinking that if WANTED AND NOTEWORTHY TRAITOR SIRIUS BLACK turned up that ought to be proof I'm not MLE and he can relax and trust me a bit?

The sensible thing to do is probably Obliviate him and Confund him and get out before he quite knows what happened.