Sacco san, Shelly, Maurice and Lori san -senseis all have good points.
I believe it is a harder thing to structurally destroy a large, powerful, pain-insensitive and drugged out hoodlum than we would like to admit.
Add to this the adrenalin dump, you have a hard situation on your hands/feet.
Breaking a leg is not so easy as it is sometimes taught, so I don't try to break.I kick a leg out from the inside, and buckle them, or kick the side inward to collapse the leg without breaking, or the back knee forward to bring them down with a pull, into whatever I've got waiting for them.
But if you have a maddened Steroid monster on crank and you take him down, he may grab you and take you down, too.Here we get into the realm of grappling, which with one of these guys, I prefer to avoid.And I'm not small.
So suppose you break a leg or two, and monster doesn't feel it, grabs you with arms as he goes down, and makes you one with the pavement.
Here's where I'm for admitting one's own limitations in order to find some way around them.
Sacco san says crush and destroy attacker.Well, what if you find out too late, that you can't?
I have met three hundred plus pound, seventeen year old,Point insensitive, double jointed, black belts in Dillan style Karate.Nothing worked on them but evasion and unbalancing, throwing with their own momentum, and running away.
Not very dignified I'll grant you and they were absolutely unharmed(it was in the Dojo), but what would you do if one such went bad and attacked you?
I'm for getting out of the way and getting out of the area,then worrying about macho stuff later when home watching kung fu movies.
If monster charges and you miss the leg break, what have you got to follow up with when they smash into you, grab both your legs and turn you upside down, thus changing your perspective?
When your legs are taken out and you go down backwards, your arms will automatically flail out to your rear to catch you and break your fall.
I showed an Aikido shdan this one time a Judo waza called Morote Gari, Two Hand Reap(Doble Leg Take Down).He said he could brea my neck or throw me by it if I tried.We were on a nice lawn, so I said go ahead and try.I knew what his arms would do.
I hit, his arms went back and he did breakfall to the rear, clean fall but he had not even tried to touch my neck.
My advice to everone wanting to know what they could do to such an attacker is to get a grappler, or a blue suit guy, onto a mat, learn to fall, and have them take you down a few times while you try to even fake a leg break.
You may get your eyes open.
Now, take same guy, and as he comes to attack do a Tai Sabaki(body turn) out of karate kata like seisan, or from Judo or Aikido, and find out how easy it is to learn to step out to an angle.Always step away from a grappling attack or tackle attempt, or back into a horse stance and hammer fist to back of neck.
Neverstep in or they will have you for all three meals, breakfast, lunch and Dinner.
Now push him off balance and run like Heck.
In about an hour you can get the hang of this pretty well.When you can do this every time, then learn some counters from your off angle position.Then un Like Heck.:-)
Regards to all,