I don't think that any one would dance while fighting. so, choreography infighting scenes is unrealistic. But fight composing is necessary for making the scenes realistic.
However, Tandava dance by Shiva is a result of anger. But this is only manifestation of anger and not fight.
Dancing beore starting a fight is very funny. I know that we can express our moods by dancing and singing. However, fights and dance should not be mixed up.
I have seen some TV serials where they have shown fights when it is necessary and dance when it is necessary. They have not mixed up the two.
They best scenes are in the cartoon mythology movies. It is sober, funny and meaningful. Good for children and elders too.