When a Balrog is hungry, his stomach growls. How loudly it growls depends upon his hunger number and his food number. The loudness of his growl will be at least 2 and will be the lowest number that you can mod both number by to get the same result. For example, if hunger is 86 and food is 46, the growl number will be 2 since 86 mod 2 = 46 mod 2. However, for 25 and 18, the growl number is 7 because 7 is the lowest number that mods both 25 and 18 to get the same result.