Backing off the vehicles with very rough assumptions about speeds, would have the bus starting his turn well before you were in the pinch point. Likely he misjudged your speed, or simply figured you'd use some common sense and slow to avoid a collision.
It's not a question of right and wrong, it's about using common sense and judgement to avoid a possible collision, regardless of right of way.
I assume that you did in fact slow to avoid hitting the bus, the only difference being that you might have been able to do it sooner.
Maybe I'm jaded because I've been riding and driving in NYC for 40+ years, and am used to the concept that who ever's first wins.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.