The "salmon" part is still confusing / meaningless. Sidewalk traffic is two-way. Is it a sidewalk next to a one-way street, and he's therefore avoiding circling a large block by using the sidewalk? If not, I still don't see where "salmon" comes in.

What's the local ordinance there wrt. bicycles and sidewalks? Is the person yielding to pedestrians, and riding in a manner consistent with that of a pedestrian? There's usu. language to that effect in the ordinance. Some ordinances prohibit bicycling on a sidewalk where a building directly abuts the sidewalk (safety for the cyclist and others).