Notes:

Source
From Chapter 19 Birthright.

To be fair though, this is what happens when Corrin fights Niles in the same chapter:
Niles: So, you're the little thorn in my master's side, are you? Very well. If he wants you dead, who am I to argue?
Corrin: I still can't believe it. We lived as brothers…
Niles: Oh, yes. The suffering on your face is simply delicious. Now, let's see what happens when you have a few more holes…
Corrin: You're sick!
Niles: Oh, please. This is war. This is my job. I'm good at what I do. I'll try to make this painless so you can die in peace. Deal?

It's an odd reference, but it works.