Umbrella Pas De Deux | Walk Sydney

I wrote a thing for WalkSydney: Umbrella Pas de Deux

When it’s raining, and everyone has their umbrella out, and you are passing someone going the opposite direction, and you are holding umbrellas at about the same height, and the footpath is narrow, your umbrellas will collide unless one party raises their umbrella, the other lowers their, or some combination of the two. What is the protocol for Umbrella Pas de Deux?