How long would it take to catch a deadly, lightning-fast green mamba that is totally on the loose on top of a tall structure, and then do a thorough investigation and safety inspection to find out what happened? A lot longer than ten minutes. Mambas are the fastest moving snakes on the planet, and catching one is a very serious procedure requiring special safety equipment. Doing a safety investigation before re-opening would take even more time. How long does it take to pick a rough green snake off the roof? About ten minutes, most of which is setting up the ladder carefully so the exhibit doesn't get damaged. Do the math, folks. It's pretty easy.