To get a handle on what Billy and Charisma are talking about, the least you need to know is that HEX2O is “magic water” which allows invulnerable people to cut their hair, shave, etc by making metal that’s been exposed to it strong enough to cut, but only for a few seconds. You may want to review the following pages: about HEX2O and Billy’s baldness fears… 6.16; Kaycee uses HEX2O against Charisma… 6.19; Charisma confronts Kaycee… 6.25; Kaycee lied?…6.32