You might want to think a bit about #4 there; it's obvious you think you understand physics more than you do. The person doing the kicking is only going to fly backwards due to conservation of momentum if he/she had no forward momentum before the time of impact.
If you can explain how someone can impact with someone who's not moving without moving toward them (and thus, having momentum), I'd love to hear about it.
If you can explain how someone can impact with someone who's not moving without moving toward them (and thus, having momentum), I'd love to hear about it.