I played without the Grey face patch and don't remember having problems with this issue.
It doesn't matter which character goes down first as long as you survive the battle.
Another character in my party could cast first aid so as long as one of them stayed conscious the rest of the party could get healed fast.
If you find an item of regeneration you don't even need external help to get back to consciousness.
The best solution is killing the monsters before they can do much harm.
Well this is all good and all but I'd like to make use of my knights and paladin who wears plate, It seems that when my cleric goes unconscious, the monster's targeting goes back to normal and diverse their attack on all my other characters. But as soon as I heal my cleric back to health, the monsters focus on her immedietly. So it is pointless to keep healing her.
I highly doubt that this was part of the design choice, so I will be starting another party and see if the bug still insists.