Even though Felix was slowly getting adapted to fighting this tower defense mode.
It didn't mean that he was successfully parrying all of the enemy's attempts to destroy the ship's shield.
He was just one person, and there were multiple flanks that the enemy could use to get around him. The flanks were all defended by Felix's comrades, but his simulated comrades were very inferior compared to the enemy's firepower and numbers.
He was at a total disadvantage here, and he wasn't sure what to do to win this battle.
He did not know military formations, nor was he a good leader. He only had the lead once when Lindo and Diorno gave him that temporary general position.
He felt rather dumb in this situation when he had to make use of his comrades in tactical ways, as he only knew how to charge and fight.
He needed someone else's insight, someone who was experienced in this type of stuff as he didn't learn it until now.