From what I saw back when nunchaku were a fad, they were far more dangerous to the user than to any adversary.
I’ve only known one guy who could actually use nunchaku and have even seen a stage performance where I had to laugh at the expert.
My buddy could actually use them and blocking efforts would only redirect him as his recovery was instant and fluid, of course, he didn’t carry them in real life because they weren’t as effective as the sawed-off shotgun he carried inside his shirt hanging from his neck.