Well, if I have a 8 model disciple squad, 1 model is engaged in CC with an enemy model (last one on the table) and hasn't managed to break away with it's 3 actions, i have 7 models left.
They can
A) do nothing and WAIT (thus on the enemy model's next activation they will probably kill him, but only after he's killed my model)
B) try and shoot with the shotguns on the 2 models in CC, thus having a chance to kill my one too
C) try a couple of CC attacks each at the enemy model.
I think option C is the one that gives me the best chances at killing the enemy unit without losing my one.
Oh, and the previous scenario has happened to me twice in the last week!