This is the most realistic version of Jason
Sack head Jason is honestly the most realistic version of Jason there was, just some wild deformed hillbilly man living off the land out in the woods. He felt pain in this, he showed fear when the chainsaw was coming for him, he wasn't unkillable, he went down hard when he got kicked in the balls, and imo he legit died when he got the machete through the shoulder, until part 3 that is. That crashing through the window at the end was obviously a dream sequence.
I'll always love part 3 and 4 Jason more in terms of look and scariness but when it comes to Jason being the most realistic as some crazy wild man living out in the woods this one is the most realistic representation.