[The arm grab conveys everything that Alucard needs to know. He nods once, sincere.]

Yes, of course. Do you have something on you that has the scent? [He pauses for a moment, considering.]

If not, I can change forms and try to get the smell off of you. It'll be fainter, but I should still be able to pick it up. Likewise, are there any spots that your friend is known to haunt?