This is madness! If you tried to recreate this, 999 times out of 1,000 you would crash and burn, it was pure luck they found their way out, especially considering three layers of ice.
You can't budget for decision making, and it's difficult to teach. When I have students who I perceive have bad decision making, I try to create some scenarios in flight to judge what they will do, and we can discuss other options as we go along. Generally the ones who have the worst decision making don't make the grade, but when put under real life pressure you never know what someone might decide to do.
Ultimately you'll only ever get this lucky once, so these guys must now be on borrowed time.