I'd have to disagree Bill.... when you take on the role of OIC, you need to stand back & watch your crew, watch & manage the overall situation....being the OIC doesn't preclude you from helping your crew if they are struggling, but if you get too involved in doing the work with your crew, you risk loosing the big picture view, which can potentially be very dangerous.
In my book, the role of the OIC will vary to a certain degree, depending on how big the incident / how many resources are involved.
The OIC is responsible for assessing the situation, (including risks to the crew), planning a course of action, organising / directing the crew to carry out that plan give sitreps, calling in additional resources as required, liaise with other crews / services as required....
Having a good crew makes the job easier, in that you don't have to give step by step instructions to your crew...and leaves more time to do all the other things an OIC needs to do!!
With a simple incident, it looks like an OIC doesn't have to do much at all, but in whether people realise it or not, this above process is what actually occurs....
Pip