Here is a simple way on how to cut rope in an emergency situation.
Say you are spending the night in the woods and you need some shorter rope to tie down your tarp with. Use friction.
That same night in the woods and your buddy breaks a leg. You need some rope to lash a splint together but can’t find your knife. Use friction.
Say your horse is running loose and that rope the local sheriff is trying to lasso Trigger with is just too long and bulky. Use friction.
Say the zombies are walking the earth and you need some shoelaces for those boots you just scavenged so they don’t fall off while you are running for your life. Use friction.
That’s a little tongue in cheek, we all know horses aren’t real.