Be prepared to mention any steps you took to upgrade your skills, strengthen your knowledge base or modify counterproductive behaviors. The reason you would have done it differently is because you learned how to handle a difficult situation in order to get a positive outcome. Given your subsequent experience, you can say that you actually did handle it differently later on and alleviate any concern the interviewer might have about your toughness or assertiveness as a manager.

Yes, though I tried to do things in a better way than in the past, but there is always a scope for improvement and nobody is perfect so I feel if I put more and more efforts in my learning things, I might have performed better.