[He swallows and nods. For a moment, there's nothing but the sound of his breathing. Then:]
I... killed someone. I didn't mean to, I was- he was trying to kill me and I was trying to get away, okay, and I had to climb this metallic structure and Donovan caught my leg [which he meant to eat, incidentally, but he leaves out the detail] and I... I collapsed the structure. A metallic pole went straight through him.
I didn't even try to help him. [It's obvious the last part is what has shaken him up the most.]