That rug really tied the room together.

A and B should already be going a safe and prudent speed. A should not slow down appreciably because that would encourage bad behavior by B. B should slow until it is safe to pass pedestrians. A and B should both be prepared for the unexpected from any party and take corrective action with everyone's safety in mind. If B makes a squeeze pass he should be called out for his ****** move. When I have been in this situation I have always been looking far enough ahead to anticipate safest move, when A speed adjustment to not let both of us to meet where the walkers are, if B slowing as much as needed to avoid meeting A at the same time as walkers.

IMHO part of the problem is when municipalities build bike trails as a way to get bikes off city streets they add risk to walkers using those trails. We as cyclists are compelled to operate with due regard for safety. How to communicate that to others so they understand and adopt safety driven cycling is a challenge.