At a Con last year, we were having an easy (and goofy) time going through Among the Living, that is until the end. (No spoilers)
One of the frontliners was cornered apart from the rest due to poor maneuvering and down he goes. I believe with a crit from good health to well below zero.
I make eye contact with a friend of mine and our gears click, it just became real dangerous and we were the only two with healing. We had one round to revive him or he's dead, and the fight had just begun so we needed him swinging. It didn't help that we were somewhat fragile compared to that frontliner and had to run past the enemy to get there.
Wordlessly, we looked at the map and our plan unfolded as it had to.
His well-armored Cleric was playing above tier and with no healing other than a wand (which would not be enough), and if I recall was too slow to get there and help anyway. He runs through taking the AoO, also blocking off another enemy from moving in. This clears the way for my Mystic Theurge to safely dive there with a Cure Moderate on my hands and get the guy functional. So yes, two prone victims and a big baddie staring down at us.
From the ground, the frontliner grabs his weapon (safely) and takes down the enemy from there.
I really liked the way my friend and I were able to execute without table talk. Felt pretty cool.