Hmmm, right wingtip of one aircraft, and right vertical stabilizer on the other aircraft. Either they were going head to head, or one of them was trying to reproduce that scene from "Top Gun."
Doubtful.
More likely, they were on their way to Marshall in a Right Eschelon formation, (Lead left and out front, Wing tucked in right and low).
If Lead decelerates and Wing doesn't catch it, Wing cannot break right, as his left wing would come up into Lead, and they would both likely be dead now.
So, Wing pushes LEFT and low, to go under Lead, and probably caught the starboard tail on Lead's starboard wing tip. It would take a lateral impact to knock off the Vertical stab, so this is probably how it happened.
Fault goes to Lead, if he did not call boards before slowing, or fault goes to Wing, if Lead called it, and he missed it.