He wasn't going to stop her. Not verbally, anyway, and it's doubtful Jo is all that cowed by the wrinkle in his forehead that grows at 'Sam was for it.'

Stopping Mary just gets a look, assuming the force they'd be trying to stop would be Motherly Concern.

The closet door is closed, weapons hidden, and he gives a final look to the house. That's the real thing that bothers him - the house. And how easy it was to get in, with nobody around.

Jo is given a nod. Lead on.