Kiritsugu finally realised that there was something different when he attempted to tighten the muscles on his arms and legs.

He could move them. His fractured bones were now in perfect condition, as if they had never been damaged. The echo of that pain remained, but the injuries were gone.

“... I see.”

Kiritsugu finally understood the true worth of the trump card within himself. It seemed Avalon could heal injuries caused not only by his enemies, but also the damage his body caused to itself. This discovery gave Kiritsugu, who had at that point had fallen into a desperate situation, against an unimaginably strong enemy, the greatest confidence in the world.

- Fate/zero: Act 16, Part 6