Sam wanted no part of the latest "mission."
Long association with Dean had taught him the warning signs of trouble and this latest idea had all the earmarks of disaster. After all the messes Dean had dragged him into over the years Sam had no qualms about bailing on this mission, although he did feel bad about abandoning Cas to his fate.
He inventoried the Impala's armory, caught up on their communications, and did the laundry. Now he was bored. So he went down to the shuttle bay where they were currently storing G in his force bubble. He felt a little guilty about their continued imprisonment of the little alien.
That guilt faded after a few minutes of G's snarky conversation. It totally evaporated when G made the mistake of referring to the time he had killed Dean repeatedly in front of Sam.
Sam was currently running an experiment on the reaction of G's force bubble to physical impact. Since it had withstood the force of an ion storm carrying dilithium space debris, the bubble wasn't affected much by the impact of a small rubber ball. Still, you never knew when data like this might come in handy and every good scientist was aware of the importance of validating results through repeated measurements.
Sam was currently on the 147th repeat of the bouncy-ball test.