I think it may have been the moment the mother realized that the time had come. Lenny, in his speech, says on the banks of a river he experienced "peace" as an 8 year old, and then there is a one word utterance …."Peace". I think his parents were sacrificing their son to bring peace to the world……as in giving up…

Wow, didn't realize Sister Antonia's hand was at the Nuns face. I thought the Nun instinctively rolled away because her sleep was being interrupted.