I'll go along with a 'series of events'. Both planes had TCAS (Traffic Collision Avoidance System). The universal language of aviation is English. At any time, ANY TIME, either PiC (Pilot in Charge) could have and should have gone on Guard channel on his radio, gave position heading etc and deviated 1000' up or down, or done a 360 to avoid the TCAS indication. Pilot error all the way.
Few crashes are accidents.
Well this one wasn't, this was a major (to use the British) cock-up all the way.
Pilot in Charge = Pilot in Command. Got sidetracked with the vids presentation of the Russian getting a check ride as if there is a question of which pilot is in command, the actual or his evaluator.