I had a bug where i had titan tanking the enemy egi while i focused on attacking it too, i get the egi's health down but i couldn't get it to zero for some reason so i focused on tristan and when i get his health low enough he tries to absorb his egi but he couldnt. so the egi stayed out during that final phase so i had to deal with the egi's attacks and tristan's attacks. made the fight so much harder, but this was a couple of months after the game was released