"I'm sorry... I'm sorry..." Rob mumbled while running away in random directions, "I'm sorry Lenny, I just did what I had to..."
When the monster had just killed Trevor, it was standing in between Rob and Lenny, and the monster, whom none of them had seen or heard of before, was eyeing for Rob next.
At that moment, Rob just wanted to save his butt, and no one else. So he grabbed a fairly big rock from the ground and threw it at Lenny's head. Lenny, who was fixated at the monster, couldn't fight the rock and fell on the ground with a thud. The blood gushed out of his wound on his head and attracted the monster. The monster ignored Rob and jumped onto a defenceless Lenny. What happened next was nothing less than a scene from a horror movie.