He followed the path of what seemed to be his new partner in survival. They came to what appeared to be a larger than normal tree. It was hollow. Virt assumed it served as a shelter to Leeroy. Seeing his motion to follow him up the rope, he takes note of that notion and proceeds to climb the rope after Leeroy.
At the head of the entrance, he heard something behind him. A call for help. He turned around and saw someone running towards him, and yet another creature following him. It's skin was green and had it's arms out, much like the stereotypical zombie. Virt truly wanted to help, but figured that all he would do is get in the way of this person's escape, and Virt wouldn't need to do anything as long as he just kept walking at twice the speed of the zombie -- it was relatively slow. Add the fact that it was currently burning in the bright sunlight, then you get an even easier escape due to an early death in the future.
The only thing Virt decided to do was to alert Leeroy to keep the rope there and let the person in.