The sword is tied to his right hand. You see a light at his left hand (him taking the dagger out of the item box) and then him throwing the dagger with the left hand.
Yes I think Rain is right. The new dagger is still bandaged to his hand. He was throwing his old dagger.
And the magicians do not wear heavy armor so the old dagger is enough
Me: See, I told you that you were wrong!
Brain: Well, technically speaking, that means that you are the one that's wrong.
Me: Uh.... don't sweat the small stuff, okay? (￣∇￣")
Brain: ....
Anyways, thank you all for the explanations :)
Me: How did he throw the dagger if it was bandaged to his hand?
Exhausted brain: He obviously threw the hand as well, duh.
Me: Ohhhh.
...
Me:, Wait a second.... That's not how human anatomy works?
Exhausted brain: ┑(￣Д ￣)┍