He sees that now. It shakes his theory that this might be the afterlife, because he wonders if a robot might actually be alive... if this man is indeed a robot.

When he answers, it seems that Malcolm is incorrect. Whatever this man is, he considered himself 'alive' at one point.

"Is there any way to tell?" he asks, his shoes brushing in the sand as he swings gently back in forth in his hammock.