I have seen many different situations where twine won't break or slip knots don't come undone. I have never been able to undo a slip knot on a panicking horse, on other people's horses, different types of slip knots tied.. and not just me, I have had big burly guys not been able to undo them. Every time I had to unbuckle the horses halter and set them loose (enclosed area) or cut the twine. Once I saw 4 horses tied with slip knots to twine pull part of a fence out of the ground, freaking out dragging it all over, which made out several other horses panic. Only one horse broke free, I had to cut the twine on all the other horses.I will only tie to blocker tie rings or some other special release tie ring.
“Good things come to those who wait… greater things come to those who get off their ass and do anything to make it happen.” - Unknown