I hope they take out the boss to save everyone. The people following Kanehira don't need to die for taking the easy way out and joining him to kill the natives and the natives don't need to die for this sick game. Kill the Doume boss!
Hmm... Wasn't expecting this strategy. I thought the surprise was going to be that Kanehira got the douma involved, or that the douma king would simply be attracted to (or interrupted by) both sides fighting.