This pertains to the red space of the Peril track on Battle in the Mistlands.. "Each hero claims one (success) and becomes engaged with 1 enemy in the shadows. That enemy suffers one damage......"
So, what if there are zero enemies in the shadows? Are the heroes then prohibited from choosing the red peril space? Would they be unable to use the red space option until there were four enemies in the shadows (during the peril phase)? Or would they just become engaged with however many enemies that were in the shadows, even if that number was less than four?