Actually, it was a good idea. The kids (ok, they were mid 20's) were nice, but had no clear idea about putting the rig together, and they had no buoyancy control to speak of.
And they basically understood the gear, but couldn't actually use it in the water. "Which button do I press to go up? Not that one, that was down, nope! Too much, the other one, ahhhh! too much the other way!"
They were both comfortable in the water, but it was their years at summer cottages and playing in lakes that gave them that comfort. Not the dive training they had received the week before.
They laughed at the comment and were OK with the help and attention they received by the shop and DM. They were planning on (as they said) "taking some real training" when they got back to Ontario.