When two neighbors who used to be great with each other and you know both parties quite well are now involved in some sort of drama, what do you do? 

My instinct is to stay away from it.. But it’s also a pity to see their relationship went down.. 

 @a0e5b29a My experience says stay away. If they sort it out, great. If not, I’d try not to take sides and deflect any attempts to draw me into the fight.