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Want to see something funny? Try giving your partner a Pass Scarf and let him wander around by himself.
The Pass Scarf reflects attacks to the attacker provided he's next to the Scarf holder. However, if you use it your hunger will skyrocket. However, your partner has a different hunger system that ignores the penalty of the Pass Scarf. So, as long as he isn't being attacked with beams or room moves, he's never taking damage.