The AB 380 is a monster. I can't see taking an evacuation slide from the upper deck. My guess is it is about a 40 foot drop. Qantas had a major engine failure some years ago. When the plane lane landed and the engine wouldn't shut off. Instead of using the slides, better heads prevailed and portable stairs were brought in to offload the passengers on the good side of the aircraft The engine finally shutdown when it ran out of fuel..
The videos of the slide off the upper deck of the 747 were frightening. Even worse was the pilots’ means of escape: grabbing a handle that was attached to a metal ribbon strap cable and lowering to the ground in a free fall. If you got that metal strap around your neck or leg or arm, you were dead. That thing gave me nightmares. The only film I ever saw of someone using it was filmed sometime in the 1960s.