It's not clear. He was preparing to make a left turn anyway, so he would have to move left at some point. I think he moved left prematurely, without checking fo

It's not clear. He was preparing to make a left turn anyway, so he would have to move left at some point. I think he moved left prematurely, without checking for oncoming traffic. Maybe he was also trying to avoid the other cyclist, I don't know. He should have slowed down and waited for both cyclists to pass.