...as a quick example, in a night club a large man was pushing people, hoping to get a response. Many people did not respond, and just walked off. However one person turned round to repreimand the bloke; as the bloke was about to respond with a punch, I couldn't help myself and just slipped in, with an irimi-nage.
At the end of the day you just do what you do in these types of situations - I didn' think, I just acted. The fact is, I'd spent years training to respond when someone throws a punch. Whatever we 'say' we will do, if we are practising aikido safely, we are actually practising to be able to deal with people in quite a non-aggressive manner. Although I have leant how to kill people, I do not practise that, and therefore I would need to bring my concious mind on-line if I was to kill - better this than the other way around.