It’s common for someone not paying attention to turn at the last split second in a last ditch effort to avoid rear ending someone.
In addition, the impact can throw the rear ended vehicle in the opposing direction of the impact. IOW, if a vehicle is impacted off center on the right rear end for instance, the impacted vehicle will move forward to the left in many cases. In this case it seems, into on-coming traffic.
Like billiard balls.
A good reason to remember what direction to turn your wheels when this is happening. Just like when you’re taking a left across oncoming traffic, to never turn your wheels to the left before turning.