Definitely a stupid cliffhanger. Who cares who has immunity? Also I knew the ice thing would be a problem the second that the driver asked them to sign the invoice. I think they've pulled that trick on the show before.
And as always, Mary's voice makes me want to shove a shotgun up my ass at a family get together and make my 6 year-old nephew pull the trigger so that not only does my entire family have to witness my gruesome death but my nephew has to live his entire life knowing it was his fault.