[he considers this for a moment while focusing on the contrast between the chill autumn air and the warmth of Amy in his arms, the smell of her hair and that something which is indefinably her]

I ... don't know.

I mean--I guess you could look at it as just a stone. A stone with my name on, but it's just a stone, so it doesn't mean anything at all. Except ... [and here his mouth twists a little] Except I know I'm actually dead.

[a sigh; he's not sure how to properly articulate how he feels]