I agree, a luck task would be a bad way to go out on the first leg and that may be what happens. The sandcastles should be interesting because in theory, every team will have close to 400 sandcastles to search. If they weren't rebuilt, the last ones might only have 100 to search. However, now the last ones will have 2 or 3 clues in 400 sandcastles rather than the full 12, so that makes it much tougher on them and may lead to the teams quitting. Probably as a group so them finish the 4 hour penalty at the same time.