The MO of the cannibals is to capture their prey alive and make them walk back to the camp, Adam knows this. If Henson were to start shooting, then the cannibals will be forced to retaliate and all the people in the basement are likely dead.
When the bell is blaring and the girls leave, Adam says something like "it's all up to them." The guys job is to stall and keep the the cannibals focused on them (without provoking a confrontation) while the girls try to take the scouts from behind.
Ultimately this ends up being a wise decision as by not getting in a shooting match with the cannibal scouts they have more bullets to defend the house during the main attack.
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