Leon tried to suck the mana of the flesh while his own mana was in touch with. However, that didn't work... it was like he was trying to drink the water of a bottle by making a small hole on the bottle. The hole was so small and ridiculous that it was like it wasn't even there.
"I guess this is a failure... Although I want to drain the mana, this isn't the way I imagined it would be. In the end, draining mana from a distance and without putting myself at risk is a crazy wish."
Suddenly, the damaged flesh started to repair itself, and Leon's mana begun to disperse. Being so close to that process was scary and disgusting, but Leon didn't take out his hand. He decided to take that risk in order to feel the mana inside that small amount of flesh even more... even if he had to lose a hand.