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I thought Determinator was about never giving up, regardless of the odds.
Fiat iustitia, et pereat mundus.I don't think this is Determinator. I think this describes a situation where a vehicle or a weapon responds to the Heroic Willpower of its user and suddenly goes faster or shoots better despite physical limits on what it can do.
Rule of Drama may cover it
Context-Sensitive Button is related
I guess it doesn't get much closer than Heroic Resolve or The Determinator. I was looking for the specific subtle reality warping thing. Rule of Cool/Drama has to cover that bit I suppose. Thanks anyway troopers, err, tropers.

A trope related to Heroic Resolve with a good measure of Rule of Cool and a subtle shade of reality warping. The hero has to perform a task that forces him go to his limits and manages to pull it off after he threw in some more determination, even though his determination has no influence on the chance of success whatsoever. Examples would be: -Chasing the bad guys in a vehicle that ends in a speed race. The vehicle's speed should be rather independant of the driver -Using any kind of machine, especially exoskeletons. -Blocking off enemy fire with a shield. It seems most shields in fiction are powered by the hero's resolve. Holds true on both side of the gun.