you know at 1st I was in the "how can he still be alive...he was cut in 1/2...blah blah crowd" Then I realized, with the darkside we see so many sith lords survive long past when they should.
Darth Zion can't live without the darkside holding his body together..
The Emperor in TOR has lived how many years beyond any normal age due to life sapping?
Darth Bane surviving with alien life forms in casing his body...
Darth Vader losing both his arms and legs and burned from lava...not fire, LAVA
thats just some, I can go on... but basically, just being cut in half, is relatively minor to survive from, for a Sith lord