Not bad for both Atemi and Randori and it illustrates a basic difference between some styles of Aikido and IMO can be dangerous...
When Uke strikes Nage stops the attack by focusing on the hand blocking/grabbing it before "doing something Aikido like" We teach our students to leave the hand alone IOW let the strike pass and focus on taking Uke's center. Your focus should be on Uke's center not on blocking the strike..A good boxer or striker would destroy you if you did not enter with them and take their center right away.
Timing is everything..I also find that if I focus on the strike I miss the opportunity most of the time to enter. Also if I assume some kind of fighting stance an experienced person may not enter right away but will themselves move and try to get a better angle of attack. Basic sparring is all about looking for an "angle of attack"
I like the kind of advanced Randori were Ukes look for an advantage and try to exploit openings themselves Let me tell you if I am being honest with myself and focused on bettering my Aikido. most of the time the Uke's win...Why?
Fight or flight takes over and I start fighting (like assuming a fighting hanmi) IOW I get tired and start trying to box with a boxer or grapple with a grappler...I lose most everytime if I stay solely within the bounds of Aikido
In the context of how I interpret Nishio Shihan's Atemi I differ a bit from my Sempai. Atemi must be good enough to end a conflict...
Now I am not talking about one punch knockouts but if your Aikido is going to work at all your Atemi needs the kind of power to end the conflict.
That is my interpretation of what Nishio Shihan meant and fits in perfectly with the philosophy of Aikido is the Sword. All Tsuke with a Sword is meant to be a killing thrust. Atemi IMO must have the same philosophy. For Aikido to work as a Budo it must be a Martial Art. This where I completely agree with the IMA and DR guys. All too often Aikido folks have no idea how to use Atemi do not practice it enough. Then there are those who come to the Dojo who have no experience with any striking art....and as they grow in their practice this weakness becomes the flaw which makes them doubt the authenticity of Aikido Waza. Who can blame them if all they know how to do is try to grab or block Uke's fist...Or...If all they have experienced is some Aiki Bunny Uke dancing up to them with their arm extended and their fist out?
That is why IG's view of the book and tapes misses a little something. Nishio Shihan simply shows how and why the fight is over through Atemi and like Stefan suggested we invite Uke to end the conflict at many points during the technique. However he could walk the walk too... Believe me if he or one of his Senior Students did hit you "stopped" fighting and allowed them to finish the technique or end the conflict. I mention one of Nishio Sensei's Senior Students Tanaka Sensei allot ( He is an Uke in some of the Videos). When I met him I noticed right away his knuckles had calluses on them as thick as quarters. He looked like he knew how to use Atemi.