He can hear someone walking behind him, but he doesnt’ look back. Maybe there’s someone walking in front of him too? He can’t really tell. Suddenly the staircase disappears under his feet and he falls into a deep hole of nothing. The whispers fade out and the only thing he can hear is the beating of a heart. He doesn’t know who the heart belongs to but as the beating slows down and then finally stops, so does Zelo as he falls through the darkness.