Fixing the dream .... here is another solution.
So, Bobby suddenly appears in the shower and totally stuns Pam that he's back.

Suddenly there is a blood curdling scream, a shot rings out in the dark, the hatchet of the seventh bloody moon appears before the zombies attack.... all that and then Bobby slips in the shower, bangs his head on the hard marble floor and suddenly dies from blunt force head trauma.

Pam freaks out and faints and goes back into the dream where the show continues on like nothing ever happened. Problem solved.