How do I adjudicate PCs attempting to tie up a significantly stronger enemy?
Situation: He tries to tie up a prone but otherwise perfectly healthy zombie. I thought a die roll isn't even worth it, because his Strength score is 9 but the zombie's is 16, so following logic he wouldn't have the strength to grapple the zombie into place in order to tie him up. Should I make it a hard Strength check (DC 20)? Or just narrate it as "You try but the zombie's greater strength pushes you back"?