#4 is only partially correct. First, bullets can and will spark if it is the right round and hitting a hard surface. As far as the kicks go, someone else was correct in that the person being kick will move while the person kicking will not, unless they just suck and don't know what they are doing. Part of martial arts are the stances which are there for a reason. When done right, the stances are very stable. If he thinks #4 is that big of an issue, how does he explain the famous 2 inch punch that Bruce Lee is famous for performing in front of a large crowd? For those of you who don't know, he placed his middle finger tip on someone's chest, and in an instant, pushed forward forming his hand into a fist and hitting the persons sternum. The person was reported to go back more then just a couple of feet, while Bruce stayed in the same exact spot he was in.
I'm no scientist, but I am very much into weapons (guns in particular) and martial arts.
Someone else who posted is also corrected that most modern day ammo is either steel or lead that is covered with a layer of copper. Thus the term full metal JACKET.
We all have habits of jumping to conclusions about things or hearing something and sometimes thinking we are an expert on it. But come on, if your going to make a public post about this and sound as if your an authority on the matter, why don't you do your research first. Kinda reminds me of Tom Cruise making a fool of himself on Opera's couch...