A general thought....
What looks like a very sharp turn in the contrail at ground level may not be quite as "tight" and angle as it really was......just high up was the fast jet, 15,000 ? 20,000 ? 25000?
IMO to even see such visible contrail from a fast jet @ altitude is uncommon as they don't create the 'wake' anything like the commercial airliners.
Plus, without knowing the wind conditions at that level the trail may still have drift/been changed without (from the ground) signs of it breaking up.
More questions than answers