ehat does aram mean when he says 'mourad enjoyed being alive more than anybodyelse who had ever fallen into the world by mistake"

Mourad was considered to be mentally disabled, because of his unusual behavior. However, he had "a way with animals", which meant he could relate to animals in a manner better than most people. This ability of Mourad made Aram consider him to be much more "human" than others. When Mourad rode the white horse, he looked much more at ease and resplendent than any other rider, would. Hence, Aram considered Mourad to be better than other members of the tribe in spite of his "disability".