First of all for somebody to attack you and push you using his hands to your chest, we would assume that you would see him coming being his center mass is approaching your center mass. I can’t say with a man Will or will do, but I can’t say when he can Cant do. Depending on the distance that I notice his intention (which would be dictated by the speed of his approach) First off You would have to understand that momentum is not continuous. There is gravity at the end of each of the aggressors steps. If momentum could override gravity, you could fly. So each step starts with the least amount of force, then when the advancing foot is about to hit the ground he is at his strongest. If you ever seen A man committed to his forward progress with the intention of a forceful shove, you would notice that as he ends the the 2nd of 3 steps (By the way, if a man approaches you had a fast pace from a distance of A little more than 8 feet) you will notice that it is three steps in order to have forceful impact at a high rate of speed. However it is at the end of the second step that the body prepares It’s weight distribution and arm movements in order to commit to the heavy shove. Under these circumstances, I would advance just as his second step is starting to hit the ground. This would startle him for a moment and freeze his body while gravity takes over. This is called a flexor withdrawal reflex. Not unlike you walking towards the door quickly and someone starts to open it from the other side unexpectedly forcing you to have gravity deplete your momentum As you end the second step. So is your body completes the second step, It is at a State of shock. Momentum has ended and gravity has taken over. And he is in a momentary state of shock. He is also unable to advance because he has Scott no more Momentum going into the final step being that gravity has taken over. So his body is frozen for that moment we advanced due to the startle of your advance. Gravity has stopped him in place and I have already stepped forward so that I can catch him with a rear leg front kick as he is Defenseless for that moment. I would deliver the kick to the solar plexus region based on the forward angle of his body. Being that he is not anticipating the forward movement I am making, the startle reflex Will make him unable to defend himself for that moment impact. It was sort of resemble you Driving your car away from a red light after a turned green and getting about 6 feet and noticing a car pull out in front of you. Your body would freeze up as you’re reflex slammed on the brakes. For that moment that you didn’t expect that card to come out in front of you, your instincts went right to the brakes in order to give you time to stop. Your arms lock holding the steering wheel tightly as you now notice that airbag coming out to hit you and there’s nothing you can do about it. If you’ve Seen airbags after the fact, especially ones that had hit a woman , You’ll notice her face print with make up dead center to the airbag with no time to turn their heads or get their arms off the steering wheel. The bottom line is knowing when a person is vulnerable based on distance and preparing with the correct weapon to defend with. If the person advances slower The vulnerability changes and do you have time to change weapons. So as he comes from 3 steps away and slowly takes his next step, I then prepare with my weapon in case he wants to accelerate rapidly from the distance he would be at which would be approximately 6 feet. Different vulnerability on fast movement and a different defense to go with it. I would be more than happy to go in to greater detail with you. You can text me at 631-796-1474 and I can show you the opponents reactions and reflexes and explain how and why they work and your convenience. All I ask is that you text me the day before so I can set up a time. Respectfully, Grandmaster Willing