Not being able to untie the knot is the whole point of it. It's supposed to force you to think outside the box. The moment I saw it I thought 'Raylan is gonna force that apart using his powers.' There's some cool history behind it though. 

Side note [@Ace of flames01] So Raylan was told not to leave the grounds and be social. His baby sitter and the group just left the grounds. That kinda puts him in a catch 22 type situation where he's damned his does and damned if he don't. I think leaving with the group fits his character. You good with that?