Later, two Resistance A-10 airplanes are shot down while trying to intercept a machine transport. Marcus locates downed pilot Blair Williams (Moon Bloodgood) and they make their way to Connor's base, where Marcus is wounded by a magnetic land mine. Attempting to save his life, the Resistance fighters discover that Marcus is, indeed, a cyborg, with a mechanical endoskeleton and a partially artificial cerebral cortex. Although Marcus believes himself to be human, John thinks that Marcus has been sent to execute him and, orders him to be killed. Blair helps Marcus escape. During the pursuit, Marcus saves John's life from Skynet's hydrobots and the two make a bargain: Marcus will enter Skynet's headquarters in San Francisco, to help John rescue Kyle and the other prisoners, if he lets Marcus live.