Imagine an object at distance x from an observer subtends an arc of 10 mrad. That object moves 5 times its length, which creates an arc of 50 mrad. That can be said with certainty.
If an identical object were at distance 10x then it would subtend 1 mrad and the movement 5 mrad. Again the ratio holds true. However, in relation to the observer one appears to have travelled ten times further.
Imagine the observer turns through 1 mrad, that movement encompasses a tenth of the object at x but all of the object at 10x. The observer's frame of reference appears to have travelled the length of the object at distance, but only a tenth of it close to.
Without knowing distances/speeds there are too many unknowns. You don't know how much of the movement is due to the Apache and how much to the panning as a "length" at the background does not equal a "length" at the Apache.
As for the lift on a rotor blade being directly proportional to RRPM squared. I've previously pointed out that if you deliberately choose to ignore the change of CL along the blade due to alpha changes then that sums it up.