Spoiler Signal

Perhaps we should consider teaching that the first thought with a
sudden signal (fan, wag, rock, ...) should be check your
configuration, particularly the spoilers. It should not take more
than a second or two. If the signal really is to release, there would
be a very slight delay to pull the knob, but it would avoid some bad
consequences, and the the tow pilot still has the ability to dump the
glider.