Marshalling duties

[David Church]

I had an incident during my final at Taplow last Sunday that made me want to ask this question and see what sort of debate would follow.
As a marshall what is expected of you.
The situation that happened to me.
I had made my way up to 3rd after starting 6th in the A final, second place crashed, I saw it out of the corner of my eye, I decided to go round the outside of the crashed car which would have put me in 2nd, as I went wide the marshall ran out to marshall the crashed car, whilst doing this managed to kick my car into the wall, as he was marshalling the crashed car a few more ran into the marshall, he put the 2nd place car on his wheels, then put the cars that had run into him on their wheels, then saw my car up against the wall. I was then marshalled, I lost some 6 seconds and 4 places, well race over, no chance after this.
So what takes priority when marshalling, the crashed car or the cars coming?
If the marshall would have left the crashed car I would have been in 2nd, if he would have marshalled without getting the way I may have been secong, for sure I would have remained in third.
Should the marshall be 100% sure he does not affect any other cars race, or marshall the car that had earned the better position as fast as possible.
Let the debat begin.
I have seen a wide and varied level of marshalls at many different races. I think this is an interesting topic.
I was a bit disappointed with what happened to me in my final, but after that's racing,or is it???