Are You Half-Alive? (Hope you're not)

Once, you were travelling in a train.. to the place where utter horror awaits you, Gordon Freeman.. A simple task... A complex sequence of events... An army of aliens... A fight for survival...Just when you thought it was all over, that you've beaten the odds and you finally made it. You thought you would be walking into a hot shower after sipping on some hot cocoa...
Well... You thought wrong... You may have survived the first encounter...
But could you survive...