How do I get this enemy to target R15 rather than R6?

So i'm making a horror game off of what I can find in the workshop and i found a really cool herobrine npc that is really fast, has unique animations, and just seems to be a cool thing to add in general. the problem is however, that he will not target R15. However if i change the game settings to R6 he will run after me. I assume that it has something to do with for example replacing "torso" to something like "upper torso" in the script, but i'm no good at Lua and have very little experience in java and ruby. the script seems to be too long to fit in this post so if i can add it in a comment or get it to anyone in some way i would really appreciate the help.