How can ANYONE not figure it out ?
1) The guys tried to kill you (by turning on the fence)
2) The crazy lady implies they're hiding something
"You can't see Mark right now, you have to take my word for it, he's fine and needs to rest" "the diner will be ready soon"
and of course the thing that sold it for me was Danny saying with an evil smile on his face "be ready, the super is gonna be REAAAAAL good".
So before you break into the barn, you know that : they are murderers, there will be something special about the diner, Mark had a ridiculous injury and yet can't be seen
I thought we would find him without his arm off (since he was shot in it) and was kinda surprised it ended up being the legs.