Orion stayed near the rear of his group. His energy wasnt fully back yet so he wasnt exactly pumped to be running into a war zone. When he got out of the tunnel like structure he turned around intent to cover the rear. Plowing through the onslaught didnt necessarily mean That they were all down for the count. Sure enough some got back up as they passed them but the Neptune crossbow proved to be an invaluable asset. Whatever it was a holder-magic item, it was fascinating. Most Items are simple in their output, they didnt change based on the user. This one did. While the imposter Kyojin wielded the crossbow it was a devastatingly powerful weapon. But in Orions hand its functionality had completely changed. The fIrst time he pulled the trigger he was expecting some sort of blast like he had been ducking and dodging, but instead he got a more solid version of his Image arrows. plus a rapid fire/shotgun spread version. Orion did not expect the kick back of the shot either so he almost tripped. It took him a few more shots to get the hang of it but when he did, he started pulverizing anything that came for him. 

While at first he was taking down mages who were weakened he soon came face to face with Mages that were at their full power. He slung the Crossbow over his shoulder onto his back and clapped his hands. "Image Make: Boomerbang" He created a larger boomerang, that was mid flight that slammed into them, exploding on impact.