I couldn’t believe it’s the other day when I faced the exact scenario above except I was A and a mother on a bike pulling a trailer with a young child was B. I assumed she would slow, keep to her side and then pass the walkers after I had cleared. But NO. She came out to pass around the peds and right into my lane. I yelled, WTF as I took an evasive measure and just barely stayed upright going around her and the trailer. The walkers were startled too since she did not announce her pass or ring a bell on top of me yelling at her. It could have gone so wrong.

If anything remotely presents itself like this in the future, I will not ASSUME and will slow the F down just in case.