[Out of respect for that pride, Alucard is not going to transform right now to match. Showing off that he's a number of bats instead of just one bat seems in rather poor taste.

But the suggestion he throws out? That gets a thoughtful noise of consideration.]

The awful magic rock has been known to grant abilities that one doesn't naturally come by in the past. It could very well be tied into that. [Based on what Astarion has described of home and Cazador, this seems a stroke of good luck.] This may be one of the few times it has done anything useful.