I remember doing a tour of the MCG a while back. They had to bring lights on to the ground to keep the grass alive as certain areas were blocked for sunlight by the grandstand.Good point.
I was watching a bit of The Game on Channel Eagle today (Please don't judge me ).
They do the show from Optus and in the background it looked like they had a series of mobile heaters on the grass.
Hard to imagine why lack of sun is an issue given the dry spell we are having.
The way that players were slipping all over the place I think both sides were lucky to escape serious leg injuries or worse a knee.
That may be what you saw?