Catherynne M. Valente said this quote

Because she did not look behind, September did not see the smoky-glass casket close itself primly up again. She did not see it bend in half until it cracked, and Death hop up again, quite well, quite awake, and quite small once more. She certainly did not see Death stand on her tiptoes and blow a kiss after her, a kiss that rushed through all the frosted leaves of the autumnal forest, but could not quite catch a child running as fast as she could. As all mothers know, children travel faster than kisses. The speed of kisses is, in fact, what Doctor Fallow would call a cosmic constant. The speed of children has no limits.