Does Krav maga in US teach defense against grenades, manual killing techniques or enemy disarmament?
The main stream of Krav maga in the US teaches a curriculum that does NOT include skills used in the military context (as in grenades and sentry killing). They do, however, teach weapon disarming and are known for that. That is, after all, something that civilians need for self-defence. That's not to say that you won't find a krav maga instructor who CAN teach how to deal with grenades, assassinate, etc. Many of them, being ex-IDF, have that training. As at least one respondent has pointed out so far, disarming skills are needed by civilians NOT when they are simply being robbed, but when there is an attempted sexual assault, abduction, or homicide. Learn not only the disarms, but the strategy to know when and how to run, when and how to disarm, and when and how to comply. Sanford Strong's "Strong On Defense" is an excellent book that addresses these issues in detail, with many examples from the author's experience in police investigations. US civilians who need to learn defense against (for instance) grenades are typically NGO employees and businesspeople working in high-risk environments overseas. Jim Wagner and Kelly McCann are popular trainers for that sort of thing, and there are some krav maga instructors who teach that as well. You can download "Operations Security Management in Violent Environments" by Koenraad Van Brabant for free, just search it via google. It is an excellent resource for security officers of humanitarian NGOs. It gives a terrific overall framework for opsec for humanitarian organizations. If you're more on the business side, books like Gavriel Schneider's "Beyond the Bodyguard: Proven Tactics and Dynamic Strategies for Protective Practices Success" and Shackley and Finney's "Still the Target" will get you going.down the right track. As far as grenades in particular: - dive directly away from the grenade, and to the ground. When you're on the ground, you have very minimal exposure to shrapnel, and when you dive away, your legs are between your body/head and the source of the blast - cross your ankles - plug your ears - one of the most ubiquitous blast injuries is damage to the eardrums - scream your lungs out to open your airway as much as you can, to avoid the "knockout" effect of the blast
Who would have won between Bruce Lee and a grandmaster in Ninjutsu?
Why do you dream of what is false? Bruce Lee was a simple light weight (like a feather), who only acted in Hollywood. He was a simple loser. Then, you mention "ninjitsu", which is not even an art, but a way to fool the ignorant into spending their money. Ninja is the way of the poor farmer. He would use anything on hand to defend his land, yet he always lost!