He hears something, someone- in this train infected with some.. virus.

He walks around a bit, then finds you. He stands there, menacingly, until you turn around.

"Ooh. You work for S.T.A.R.S.? Your kind doesn't seem to like me. So, sorry.." He raises his gun.

His kind changes. He puts his gun away.

"Actually.. Lets team up, dear." He grins, then tries to walk away.