hey Conner,
you are describing a social pattern (and possible dominance) of behavior we have seen in gars. they do this in the wild, as we've seen massive groups of shortnoses and some longnoses doing this, and several of my gars used to do this in GDII.
it's likely tied with dominance in some way, but also may just be a sort of "socializing" aspect of gar behavior. in a more apparent dominance behavior, if one gar starts chasing after another and the other one actually starts swimming away, the chaser will keep in pursuit (kind of like how if you run from a standing position near a dog, the dog will usually give chase).
interesting behavior for sure...unfortunately we don't know a whole lot more about what it all means!--
--solomon