Or what appears to be vertical as contrails coming toward you do appear - as shown in the flighpath in the perspective drawings. "What you see" depends on your perspective. "What you see" as vertical may actually be moving horizontal to the earth. When if veers, what you see is also based on your perspective.
I haven't seen anything supporting your assertion of the trajectory that doesn't fit an inbound eastward contrail. That's what it would look like. That's "what you see."
You'll have to introduce some other trajectory information or reference point or perspective in order to conclude otherwise.
You need to resolve your post with what is visible in the video.
The obvious course change would be an instantaneous correction of more than 150 degrees by your interpretation, since for the vertical portion to be near horizontal flight, it would have to be moving toward the camera (impossible due to the lighting) and the rest of the plume is clearly moving northwesterly or there would be no dark top showing (as would be the case if it were going northeasterly) .
Think it out. There would also be a clear and advancing shadow line, with the advancing portion being dark beyond that.
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