First time we lied and murdered him, the second time he died because we pressured him to it. He was a nasty man. Don't feel bad about it! Murdering a foe who has surrendered isn't ethically questionable! Wait, yes it is. But this is videogames so it doesn't matter.
If you feel this trolley problem is overbearing on your conscience, if you ask him about his boss his death is no longer in your hands. Wink wink.