“Take off your jacket and attack me”

Here is an excerpt from Tohei Sensei’s Book of Ki where he relays his first encounter with Ueshiba Morihei

‘The students attacked him and were easily thrown. It looked fake. Then Master Ueshiba turned to me and said, “Take off your jacket and attack me.” I tried to grab him, but the next thing I knew, I was lying on the mats. I could not figure out how I had been thrown. I had not felt force applied to any part of my body. Had he done so, I would have able to think of a defence, but I had felt no force at all.’