In one video I didn't say why it was not good to grab on to someone's arms ?       If someone does grab your arms, you can move your hands "down" than around the outsides of anothers body, to hit them.  Moving each hand down and around the outsides of others, "the thumbs of others can't withstand the preasures"?  My advice is, it is a un-wise move to grab people that know different ways to defend themselfs.