Gary Washburn tweeted that he was told it was a "stinger" and not a separation.
Huh. I've never heard of a stinger -- i.e., a pinched nerve -- needing to be popped back in. That doesn't make any sense to me, but maybe one of the medical professionals on here can weigh in.
Stingers like dislocations, cause numbess/loss of feeling in the join. So most likely he got a stinger, lost control of his shoulder and felt the tingles, and assumed it was dislocated.
The reason they couldn't pop it back in, was because it wasn't dislocated. It just felt like it was.
Didn't Pierce have the same thing several times a couple years ago?