In his left hand is a sword with a shape I've never seen before.
I guess it would be categorized as the so-called short sword.
It's not short enough to be considered a dagger, but not long enough to be a long sword.
It has a hand-guard that covers around the hand and somewhat curved double-edged sword. [2]
The reason there is a hole in the center of it, I wonder if it's so it doesn't get stuck to things it cuts?
He's not using it very much.