The Spartan's training is to complete the mission no matter what. 042 probably suggested taking the ship out and Forge got all pissed cause he likes Anders and attacked where the Spartan would see him as a threat and had reason to fight him back.Or the Spartan talked him down after a little bit of a scuffle.

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"You can't pick up chicks in a tank."-Tucker

GT-Spartan H19