Yeah, sure thing bud. Just like the saying "everyone has a plan until they get punched in the face", the same thing applies except you are being torn to shreds by a 115lb dog who will very likely have you on the ground before you even have a chance to react. There is a reason they are one of the top working dogs for police and military, how many of those have you heard of having their legs ripped off? I'm a big guy who is plenty strong but I never once thought that I could take out Cosmo if he was deadset on doing me harm. I'd put a years pay on him versus you but if you want to keep on believing you are superman then who am I to rain on your parade.
Oh no kidding!
I was a little stronger back then, 6'1" 240.
Those arm sleeves are designed to give a little so as to simulate an arm, and not break the teeth, etc. The shepherds hit so hard, the initial strike was like a 4' long 2x4 at a moderate swing. I say this with confidence, because we had a chunk of 2x4 there to illustrate the hit
Now fill in that hit with teeth on each side with enough bite force to squeeze through the reinforced sleeve.
Then there's the second and third and fourth hit in less than 3 seconds. The shepherds tend to " chop" rapidly, not bite and hold. The speed is incredible and you are trying to anticipate it.
The only dog to draw blood was this 114 pound shep that chopped up and off the end of the sleeve onto my upper arm before I had a clue.
Now these are not your average dog by any means, and the training is effective. A person can strategize about knives and punching or kicking an attacking dog and might have some success with an untrained animal. I think most people would be amazed at how fast they are, when it is their job. Our reactions are pitiful in comparison.