I have watched many Japanese boar trapping but why do you guys go all the way to tie it up and keep it alive? Does it make the meat fresher to make any difference? Are they being relocated? Auctioned off as a live animal?
Once the snout snare is on, it’s game over. The hind legs are bound first to immobilize the pic. The trapper will next cover the pigs eyes with tape to calm the pig and prevent him from biting. The front legs are next. The pig is kept alive right until it’s ready to be processed. This method has existed for centuries.
The method of your tie of the 2 legs+2 legs is savage by using the thin wire rope tight. You test the method by yourself before you tie the pig's legs tight. The method will stop the flow of the blood of the pig, when you move the pig alive. I strongly propose you to use thicker manila rope, rather than the thin wire rope.