"I..."

There is no good way to do this. How does he explain that he is killing her for her own good? How does he justify it, even to himself?

"...I know this is horrible. I wouldn't choose this if there was any other way."

Even as he speaks, the words sound hollow. He knows he'll feel horrible once this deed is done. He knows that she would probably hate him afterwards.

But it's the only solution he can see. And the only way he can protect her.

"Sorry. I won't ask you to forgive me."

And then he starts moving toward her.