The second night plus the fourth.
I can repeat again – there was absolutely no chance against the maniac. It’s impossible to block him after Bruno is killed, and therefore, the only chance that the murder will fail is if the maniac lands on a role that Arandor has disabled. And considering that Rimpel was definitely familiar with the features and actions of the roles, he came to the conclusion that killing Arandor would succeed in any case. In fact, that’s where he went in the last night, strangely enough.