Theory of the Shadow [SPOILERS.]

[Informative]

The Shadow is after the Orb.
Daniel took the Orb.
The Shadow chases the Orb, killing everyone who comes near it.
Daniel goes near lots of people. (Do the math)
Daniel reaches Brennenberg.
Daniel gives Orb to Alexander. (Still connected to the Orb)
Shadow reaches Brennenberg.
Shadow goes after Orb, looking for ways to get inside the Sanctum. Not caring about Daniel. (Too far away from the Orb to be a worry?)
Shadow takes notice of Daniel closing in on the Orb and focuses on him.
Daniel is chased by Shadow due to him closing in on the Orb.
(Daniel dies from staying in his cell too long)
Daniel reaches Sanctum.
1. Daniel does nothing. Alexander escapes. Shadow kills Daniel since he is closest to the orb.
2. Daniel knocks pylons over. Alexander dies due to him having the orb. Daniel lives due to the Shadow reclaiming the orb.
3. Daniel inserts Aggripa's head into portal. Alexander dies due to having orb. Daniel dies due to using the portal. (Indirectly)
4. What's the 4th ending?