Even before joining this game I found Ali suspicious, but it was just my gut feeling. But now I wonder why he did that move... Also, we can't be sure of Paul's innocence now.
However there's another thing I noticed: when Venus accused Walpurgis she said "If I can't protect myself then I will at least go down giving out the least amount of information possible". That's not the way to help town, isn't it?
Imo one between Ali and Walpurgis is likely to be mafia (maybe even both), so I'll vote
[Eliminate] Alistair
for today and Walpurgis tomorrow