A sells to B over ASX, B sells the same shares to A over Chi-x? Perhaps A and B are the same company?
Look at the Chi-x volume, greater than ASX volume. Rarely do you see this "equality". Something was up this morning when the initial dump on the Chi-x started proceedings. This is being worked very hard across both exchanges to make the sell off look much worse than it actually is.
I suspect the end result is a couple of hundred thousand shares in their hands as retail holders give in.