I pulled a Mikie last evening. I was going on a ride but changed my mind and did some back pack blower clean up. I went all around the yard even doing steep slopes that I had mowed last weekend. I was done except this one big slope that is under a big-tall Coast Redwood. With the winds the dead fronds were all over the slope. What the hay I, did the steep short slopes, so up I went, about 21 stair steps high. This slope would qualify for your exposure if on a bike. If moving down you cannot gain your step and stop. Knowing this I was side slope stepping. Well I started to loose my feet and went backwards, backing through the roses that line the stairs, over the wall along the stairs, ass over kettle onto the steps but that did not hold. Down the stairs and stopping face down, knees bent up against the wall feet sticking up above. Wedged into the stair tread with the backpack blower still running. It was just like crashing on my bike, pinned in place, unable to move with that 2 cycle going put put on my head. Just like a bike crash it took me quite awhile to free myself. Lucky only some lacerations and a lot of sore things like elbows, hips, back and arms.
Seems like Mikie got lucky.
Happy trails if I would of chose the two wheeler