The time it takes to turn

In a bad movie, these things never make sense and always occur for the convenience of the plot - so naturally a parody will do the same.


http://moviesonthemind.blogspot.com/

He might have been scratched by the one he said he trapped.

The hunter died from his injuries as did the neighbors and presumably the bear you hear getting attacked outside. Perhaps dying accelerates the transformation. As for Mary we don't know when or how she was infected.