I had some problems attacking the grove. Seems it's a mess either way.
A far away tiefling and his dog joining the fight and never moving or attacking(I'm guessing because of the nearly harmless poison but there is a door right by them) and then getting in a 10v2 fight with them while goblins also do nothing and quite a few tieflings much closer to the fight never joining until I engage them. There was a lot of waiting for everyone but me and my two party members to plot their next moves and deciding to do nothing.
I'm not looking forward to another big battle.