Learning about any martial art via forums is a step below getting a black belt from youtube. Just about everyone will try to deter you from looking into an art that is not theirs, that's why they practice it, they opine their system is the best. I would say go out there, find a person who claims to be able to do the same things as you see in those videos and ask for a demonstration and/or lessons. A true martial artist, will be happy to train with you. Also, be weary of people who claim to know something without having tried it. In my experience, those who claim to know everything lost their way and circled back to before they started training; at least when they started, they understood they did not know everything.