The point of the Jump wasn't to physically scratch at the King, he knew that wouldn't do much damage. He can feel the shot tear through him as he comes down, but with the last of his strength, he will at least try to stick to the plan.

There's no last words, no witty retort, Jack just closes his eyes in a calm acceptance, and tries to cast his last spell.

Sacrifice.

He slides into the familiar darkness without knowing if he was successful or not.