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The boy was another of Rennie's hallucinations. Jason awoke presumably after the toxic waste dried out the next day and retrieved his slightly melted mask then made his way back to Crystal Lake. The mask he has belonged to Jim Miller, who he took the mask from in part 8, as his other one was destroyed by Tina Shepard in part 7. Why there was an axe mark in Jim Miller's mask is anyone's guess. Probably authenticity, as it was national news that Jason Voorhees wore a hockey mask.
It's not the same condom, folks! Always be prepared with more than one!
The ninth installment of Jason's shenanigans experienced a theatrical released in 1993 in a version rated R bei the MPAA. The available DVD releases by Warner also contain the unrated version which gets more graphic in the obligatory violence scenes. This report compares the unrated version to the Workprint. Aside from some changes in the plot the Workprint contains differently edited sequences or even misses some violence. A detailed comparison between both versions can be found here.
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