Martial artist speculate about what works and what doesn't. The practice a lot of theory and they are told by their instructors that this and that will work like this. Students don't really know if their instructors have ever done it. If you are learning a technique ask what, when, and how to it. Get out their and experiment in the lab (competition). Outside of real confrontations, competition is the perfect testing ground. You have to deal with emotions, adrenaline, fatigue, pain, etc. Don't be a talker, be the walker.