LOL and at least it's each other and not you. I have seen dogs bite owners if the doorbell rang or they heard trucks outside. Barrier frustration, redirected aggression, whatever the cause, I wouldn't worry if they aren't doing more than a lot of noise.
But you might consider a privacy fence if possible, or work on total retraining, one dog at a time, til you get a solid "leave it." Involve the neighbors, get them to purposely cause a lot of noise and activity, and work on getting the dog to ignore them. I think that getting a solid fast recall is pretty important even without the current issue, btw.
I have to admit, I'm a bit lazy so I'd probably just watch for escalation. That said, if they do escalate and a REAL fight breaks out, you then have a new more serious issue and risk having to separate.
My dogs learn young that barking resulted in IMMEDIATE return into the house. A bit harder with these danged nonbarkers because by the time you know trouble is afoot, troubles pretty deep.