Nothing takes balance like atemi.
I'm usually careful with this tool to unbalance attacker. What will you use to deliver atemi?
If you are talking here about hands, the thing is, he may know boxing better than me and will use it as an opportunity to counter.
If you are talking here about atemi with any part of nage body - it becomes very interesting, I'd like to know more how you practice it.
This approach also require regular specialized atemi training on moving targets..