I grew up thinking that too, but these days, the most I hope to get from it it is to rattle the brain. I'm not saying that you can't die from a strike there, I'm just saying that it's not as easy to hit that spot as most people make it sound like. If I really want to hurt someone that bad then there are easier places to get to. To put it into context look at all of the strikes that occur in MMA from punches to kicks and no one dies instantly, correction: The number of those who die instantly are very small considering the number of people getting hit in the head. My entire rule for dangerous like that is to either avoid them or not strike them hard (with gear on). I'm of the mindset if I can: hit you with a slow punch pull the power from it and have enough thinking time to determine before impact, that I need to pull the punch so I don't severely injure you. Then I could easily blast a full power punch without having to think about it. That lack of "real-time" analysis would mean that my punch would be that much faster because I'm not running a bunch of calculations in my head while trying to analyze how hard I should hit you. So if I target spots like that, then gloves, and gear is a must, along with pulling power, and putting the safety of your sparring partner first. My back fist are more like bats then the one that snaps. I'm not fond of the snapping backfist, I haven't done one since I was 8 and in karate.