Adam dislocated his shoulder, popped it back in (in that precise moment) and continued being awesome.
Source (x)
Now you mentioned it, Adam did throw his arm out after the first jump to throw the head of the humerus out of it's stuck position hopefully it will get pulled back into the socket of the scapula, which it did.
If you observe Samohin when he sat down after the second jump, he also tried to throw the humerus out twice but it failed to land back into the socket.