Restoration

The machine needed a brain dump from Marcus. First, it must instill in Rufus the driving urge to claim back his life from the old man.

The first thing the machine had done getting Rufus back to life, following the deathbed reboot, had been to restore his physicality. Rufus was 100% the ruthless, instinctive wild animal again. He was a tough, fearless creature inclined to attack without forethought. The machine realised this could get him into trouble and thus threaten its own survival.

Rufus needed reasoning power to keep in check - but not too much.

Brutishness might well be required.