Hmmm, Hylian, at what percent is it safe to start incorperating a Nana smash while you are holding an opponent without risking them breaking free during that delay?
It depends. You can get a fully charged smash off at 60% if you have good timing. You have to Forward or Down Throw to nana, then start charging immediatly. Then back throw a little bit before popo is at half charge. Release the upsmash right when you fully let go of your opponent.
To be safe I do it at 75%.