Yeah, I didn't hear about it on here, it was from a farm rescue operation that releases husbandry videos.Upside down? I never heard or seen that before on here...I've just heard n seen the holding em down by neck till they submit.
They don't get injured and it's obvious when they've submitted as they stop fighting and relax.
As mentioned, I've done it with my little roo once and it hasn't affected his relationship with me at all aside from no more challenging me. He still hops in my lap and up onto my shoulder for cuddles on a daily basis.
It seemed less violent than boots and brooms to me and so far, has gotten results.