Gramps usual methods is to decapitating not cutting guts.
BlerghWe'll cut you up!Hey, master.That makes sense!Are you really an Assassin?I-I'm so sorry, Gramps!Ooh!GrossI didn't think you even had such a weakness at all...!So I brought Jack to help us out.Really!?Even though he's an Assassin,This guy can't even look at gross intestinal organs!If he sees someone handling it magnificently right in front of him,It could help in getting over his weakness!