The sign of the Didact

in Halo 3, it is blue, but in Halo 4, it is red.

Why is that?

No one knows why?

Probably because…he is evil.

> Probably because…he is evil.

Why would he just automatically become evil? If he wasn’t evil in the last Terminal in Halo 3, why is he evil now, especially if he immeditalely entered the Cryptum right after Halo fired?

If he is truly evil, then his sign should have been red in the Terminals as well.

Maybe Silentium has answers and the Terminals have also hinted this as well.