Not one to put himself in harm's way so easily, Shin quickly threw his weight away from Metz' knife hand. Throwing his right arm back and away to avoid the slash. Moving the entirety of his body out of the way from his foe's assault, keeping him close quarters with only one functional hand was stupid. Knowing that he's a spellcaster meant that he was forced to constantly be on the move anyway. Nothing new, aside from the dangling arm at his side. 

Backpedaling at an angle from Metz was a safe bet, there was no offense that he could put up against him if he was unable to use both arms against an armed foe. Plain and simple, this was a bad situation. Even if he tried to go on the offensive, he would be forced to rely on kicks and headbutts, and those would be dangerous if he couldn't do anything about his knife hand. 

While he was backpedaling, Shin reached over to his left arm with his right and began pushing upwards and towards his center. It would take a little bit longer while he was on the move, but it wouldn't be difficult. 

It was the only thing he could do at a time like this, aside from plan his next move.