0- could be a really weird bug. OR it could be a known bug, in which a creature does not unsummon, regardless of time, until you return to the room in which it was. Personally, I always kill off my remaining summons, just in case.
1- That is odd, they normally have interparty bantering.
2- Basically the final battle. You can leave before the final battle to restock, but I wouldn't worry about potions. Note that although you can leave, as soon as you enter chapter 7, all romances stop, period, so make sure you're done before you start it.
3- That's just very odd, it shouldn't happen
4- Like I said you shouldn't, although if you're lawful evil, you really shouldn't, just 'cause that'd be against your alignment.
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