You should call out when passing, but speaking for myself, I always, always look over my shoulder before changing lanes. That's just common sense, isn't it?
I'm not gonna just change lanes assuming no one is there, just because I didn't hear anybody call out. That's what that guy did and look at what happened to him.
Also, I don't think it's a coincidence that you wrecked your Thruster. The Bike Gawdz are probably getting offended with all of this blasphemy that's been happening.