It's not good to think about.
That said, perhaps future "members nights" should restrict their tours to areas set aside for the general public. The problem arises when members or special guests go "behind the scenes" to "get close" to the animals. This accident could have been far, far worse.
If they offer to take you on a behind the scenes tour don't go on the catwalk over the lion's cages.
Seriously though the aquarium wasn't designed to take these types of behind the scenes tours and it is negligent of them to do so. If the aquarium doesn't stop these tours, I am sure the price of your membership will increase next year to pay for the much-needed additional insurance.