I don't know if this works, but I tried thinking of it this way.
Think of a boat, just a regular boat you'd go skiing behind. If you attached wheels to the bottom side of it, and these wheels were running on a conveyor which was traveling in the opposite direction the boat was traveling, would the boat be able to move? Yes, because no matter how fast those wheels are going in the reverse direction, the water remains still, and boats use a propeller to push the water. So the boat would move. Back to the plane, it doesn't matter how fast those wheels are moving in the reverse direction, because the air remains still, therefore the propeller would still be able to pull the plain forward until it reached a great enough air speed to lift off.
I could be so far off base here...but whatever...I tried.
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