Yeah, the deus-ex-machina-like sudden resolve some protagonist gains for the same action they already repeated several times but now they become op with it.

Someones it's the gas pedal that it turns out was only half-used before, sometimes in a fight the punches only become way stronger when the protagonist is already tired, beaten, and about to collapse, even bullets sometimes start working on the big baddies from point-blank range only when the protagonist is about to die but then drops a one-liner.

Sometimes it's also yelling - someone physically can't do the thing until the boss yells at them & then suddenly it happens.