You were undercover in the enemy base and ghost was held captive and so you decided saving him was worth blowing your cover.

you then walk into his cell and ghost slowly turns his head

"If I wasnt chained to the wall right now.. I'd kill you..ghost said menacingly as he stares at you

"If you stay in here.. You'll die.." you said and tossed him the keys to the chain

he starts Unlocking "why are you helpin me?.."

he looked up at you (You decide if you want to stay or leave..)