" In any case, this is a decision that the 2 warriors need to decide on, not you."

I agree with IRonMaN. This situation could cause you more grief than you need, if you try to come up with your own answer. Use great caution, possibly even consult with your Insurance Carrier, about possible withdrawing from the situation completely.

I use the "no sleep rule" for bad situations, It I am awake at 3 AM thinking about it for a while one night, I may still consider it. 2 nights and the client is gone. My sleep is more valuable than a messy client, and I trust the rule to help keep me out of trouble.