You should have seen this coming.
After all, Lucifer's the one who taught you all your tricks. Why wouldn't he have guessed you would try to kill him?
You'd thought about what Castiel said at the warehouse, about choosing sides, and you thought about it extensively. You decided that both of your archangel brothers were wrong - that the world and the humans in it deserved to stick around a little longer.
You chose humanity, you finally took a side, and look where that got you. Stabbed in the gut with your own angel blade by your own brother.
You stare up at him, shocked, hurt, betrayed, but not even a ghost of remorse flickers across Lucifer's scarred face. He lets go of you as your vision begins to go bright white, leaving you to fall and die on the floor alone.
The last words you manage to whisper as everything fades out are "I'm so sorry, Cas."
And just before you're gone, you swear you hear him answer: "It's all right, Gabe. Everything's all right."
