Shortly after Vitue's main gun fired, Jack moved in, his shield up and his beam rifle sending shots down range into enemy suits, tearing off arms and legs if not getting the pilot like he intended. When he'd first seen the beam type weaponry being used, he was concerned that his Phase Shift armor wouldn't do him much good if he took a hit to the body, but the first time one hit his shield, he realized maybe he wasn't in as much danger, as it was easily deflected. As he got closer, he stowed the beam rifle and fired a railgun at the second hangar, intending to cause more damage before any more enemy suits came out. 

Dodging a swipe from one of the enemy mobile suits, the Duel draws the beam saber and cuts it in half, pivoting on it's suits left foot to block the attack from another before slicing off the hand. In the cockpit, Jack was working a mile a minute, keeping his head in the game and making sure he didn't take any unnecessary hits that would deplete the Phase Shift armor faster. Still, he grunted in annoyance when an enemy suit got in a lucky hit and struck the Duel with it's weapon. He sliced off the offending hand and then bashed his shield into it, following up with a slash across it's chest.