Talk:Geass/@comment-1410058-20191112041140/@comment-27492705-20200718151208

I don't think Bismark's has anything to do with mind-reading. It seems unlikely to me. What I think is most likely is a variant of Rolo's and/or Shamna's Geass.

In Rolo's case, Bismark's Geass could be changing the perception of time, but unlike Rolo the target is himself so he can see what is happening as it happens. This could also be just speeding up his nervous system. Input from your nerves and visual cortex are very very slightly delayed from when something actually happens, so his Geass could be rewiring his brain to override that delay.

In Shamna's case, because of her we know for certain that Geass can include future sight, as she says that was her original ability. We see Shamna's as malleable, but her visions are also more long range. We don't know for certain, but I'd guess before she got her corrupt Code had the same 6 hour limit. Bismark's Geass seems infallible unlike hers, but it's also momentary,  so he sees what will happen right before it happens when it generally couldn't be stopped so it's essentially a certainty.

It could be either, both, or something else entirely. I don't think anyone's said anything official explaining it. I wish we'd seen or at least heard more about Bismark's use of it so we'd have more to go off of. ¯\_(ツ)_/¯

But in the chance you'd be correct about mindreading, it seems that sometimes at least it doesn't override Suzaku's mental faculties. When Suzaku fights Bismark, Lelouch notes that Suzaku is using the Geass command to be a more effective fighter. Kind of like a limit breaker in a video game I think. More stuff becomes reflex and instinct forced by the command, but he can still plan around it. The only times it's seen to completely take over him has been when he's about to just let himself die by Schneizel's Hadron Cannon where the command made him flee and Kallen's Radiant Wave Surger which caused him to fire the FLEIJA. Schneizel is the same in Re;surrection. His eyes are clear  even when talking about Zero, his eyes don't glow until he says he sent the Lancelot as the best choice to "keep Zero safe". If people know about and willingly follow through their commands, it doesn't override them. I would also theorize that the reason people forget is only because it interrupts their brain processes and goes against their own will, so there's no memory loss if they go along with the command. Suzaku's not fighting the Geass because he agreed to survive for the Requiem so he couldn't die there, so he was at least some level of conscious of his actions and didn't experience a memory lapse.