well i am no expert, but.......
i had the same or something similar happen to me when i was a much younger buck,
the testical is a strange creature. in a nutshell (bad pun) the testical kind of hangs out there and the skin around it expands and contracts to maintain a steady temp for the swimmers. since they hang out there rather loosely they can get jostled or jarred out of place by any number of events and if they don't fall back in the right place or position they can get tangled up and blood flow can be reduced or worse. at that point bad things happen. lets just leave it at that. if he wants to start another topic or use pm to discuss it he is more than welcome, otherwise let's just leave this as a ss thread.