Ha! You forgot the first rule about avalanches. "If it's steep enough to ride, it's steep enough to slide". Though experiencing one in bounds is pretty rare it does happen. I got slid on the Quail Face at Homewood in 92.
Yeah...but it was only Diamond Peak! I was pretty amazed to feel the whole mountain slide out from underneath me! It was a nice day, sunny and in the 40's, so I was just wearing a hoodie. Was pretty wet and snow-filled by the time the slide stopped!
Quail Face is fun! That's the pic on my avatar, at the 55.