Didn't need to... as soon as you said age 13 +3 friends.. its parent math.were you here watching ? , u got it all spot on...i already thought it might just be too much fun....but i will check the CC.
Check with the three friends? Did they all get burns on their feet too? If they are like my kids, more likely they have a pit of hot coals, bed of nails, limbo bar and an ax on a pendulum obstacle course that ends at the slip and slide into the pool.