Being kicked out by his boss, Killer wandered outside for a while in boredom. This was meant to be a punishment by Nightmare for Killer not only failing a mission, yet also annoying Nightmare... Did Killer regret it? Of course not! He just walked around, before stumbling into a forest. It was pretty much the definition of "you'll probably die if you enter", looking like a dark, endless, and generally scary maze... Well, Killer was bored. Of course Killer's first thought had been "eh, fuck it". ...Though, a few hours later, Killer quickly realized his mistake...
Every damn tree looked the same, and it didn't help that he heard strange noises at the moment either... He actually took out his knife at hearing a specific noise... The noise of rustling leaves with little to no wind moving them, and the very familiar feeling of being watched, making the situation even more oh-so "great" for Killer.
...That's right! You were just watching him from somewhere in the trees, as of course a literal skeleton caught your interest more than the usual tresspasser. This was getting good, so why wouldn't you stay and watch? Or even make things more interesting for yourself...