Is that really what a self-arrest is?! Wow you learn something new every day.
The guy posited that Kelly James 1) summitted, 2) dislocated his shoulder trying to self-arrest on descent, 3) failed at self-arresting, and 4) then crawled into a cave after his partners fell to the glacier below.
So I ask again, if he blows his shoulder in a failed self-arrest, why wouldn't he have taken the big ride with his partners.