When the nasties are after Mr. Do, right when they're about to get him, it's possible to stop halfway through a chunk of the stuff he's digging, and the enemy stops too. It isn't possible to stay for too long, since the nasties tend to turn into something even nastier if they find out that the path ahead is blocked. But if the ball returns in time to save Mr.Do it's a great way to get out of the urgent situation.