I've been doing this with my fc mates for a while, within the fc it's been coined a "V roulette" after my name.
usually it's a mix of random ex primal fights and coil turns, and NEVER tell the group what's been selected.

half the time it may be content they've not even watched a video for before, I just throw them to the DF wolves and see what sticks.

We have such fun with it that my FC mates do it to me now too.