Finally figured the beast patch...
But now I have another problem.
When I reached the Barclays' farm, I wanted to have some fun with the zombies and I made Tiffany submit...
=> Debra and Big Barney were in the party at the time ; but with the party defeated, obviously the horse ran.
Then I noticed that Debra's health bar was at zero.
=> I tried to use a first aid kit to revive her but that didn't work ! Even in battle, I couldn't revive her !?
When I got back to the pharmacy, Debra gave me the key to the Barclay's house but when I left the building, I got a "game over" screen ?! Like what the hell ?
=> I can understand Debra somehow died from the zombie encounter, but if I can't save her, then what's the point of having me respawn with her still at 0 hp ?