To beat a dead horse with this: it probably is a dominance/territory scenario. As an example I will use dogs. Male dogs will hump other male dogs to claim dominance over another, not to get their jollies off. I have also seen female dogs hump male dogs which I do not fully understand why. I assume it is a type of dominance or possibly a way of telling the male she is not interested. Which seems feasible as we were trying to breed our female dalmatian but she didn't give in to the males we paired her with. She humped their heads or growled/barked/ran from them.
Along similar lines: the older male is getting up in years and perhaps needs to reestablish dominance over the territory. Previously it may have been understood the older one was the dominant one, but now feels he needs to do so again.
An out-of-the-box-theory: Perhaps one of the snakes has an illness and the older one is either infected and going nutty or the younger one is infected while the older senses it and is attempting to push the younger away to save the other 2.
In general: The middle one is staying out of the "fight" because he isn't involved and it isn't his fight, IMO.
As much as we know or think we know, how many people keep 3 BPs together in the same enclosure for as long as you have? So there may not be a lot of knowledge out there for this particular topic.
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