It was cut, but I think the Restoration mod has the confrontation back in it. I don't know what happened to Sion though. All I know is that he got his butt kicked.
yeah that scene was awesome
Sion:I don't need you anymore! *ignites lightsaber*
Nihilus: *random sith language* *Then proceeds to wipe out the room*
Sion: D: ok then *limps away*
Ontopic, yeah I do think sith can use sever force but they cannot use wall of light.