Never Enough

It was all built up to this moment, the final battle between good and evil. The defender of the innocent, and the eradicator of the weak... so what stopped the Trixie from the last blow?

Trixie is one attack away from ending Twilight's corruption, but why did she hesitate?

More or less an ending prompt rather than a whole fleshed out story. I guess it's a short story to show off raw writing skill, written all in one day.