i haven't read that much superman to be honest, was just my theory, just know that sentry is a beast in beastmode. and has the power of a million exploding suns or whatever, never new if that was just something they said, or if he really had the same power as an explosion of a million suns. And don't know how that would effect superman at all. But superman gets his powers from the sun, THIS sun, so sentry could fly off with superman further away from the sun, superman would then tire out, if sentry is fast enough to fly him off without superman fighting him off. a lot of theories from me here, but that's what i think. the Void is pretty powerful, and is only there because the sentry thinks it is, or if he has a mental breakdown, and it is something that can take a lot of beating.