Sometimes people tuck the grab-loop inside their spray skirt by mistake, which is why it's worth practicing one of the back-up techniques. It's also possible fo

Sometimes people tuck the grab-loop inside their spray skirt by mistake, which is why it's worth practicing one of the back-up techniques. It's also possible for an improperly burped dry-suit to trap someone in a boat (I know of at least one fatality in this way). I wouldn't expect an instructor to make these mistakes, but it's possible.