Rasputin obviously did everything in his power to stop the iron lords from getting SIVA. He even takes control of it to stop them. It appears he did nothing when the fallen came for it or when your player goes to blow up the replicator. Even Saladin says in a bit of dialogue from the final mission that Rasputin had activated all his defenses to stop the iron lords. However seemingly he couldn't care less when the fallen or your player came for it. I realize this may be speculation but even Saladin said [quote]The Vanguard still believe Rasputin to be just a warmind. He hasn't been that for a very long time. [/quote] My theory is that Rasputin is being controlled by SIVA. Or at least he has been changed drastically by it. One moment he's seen helping guardians an the other he is killing them and scattering their bodies across the cosmo. It's almost as if he's fighting for control of himself... from SIVA?