If its good news why has the share price tanked?? To be...

If its good news why has the share price tanked??

To be perfectly honest I got the impression the company was now playing with an asset they used to hand over but now they are betting that holding it will create a greater value? Or is it that St B does not want unfranked dividends - neither do I but is it a great utilization of cash resources. I could not unpack the information to get to understand it and thats always been my problem with this share. Too many accounting principles giving a lot of moving parts so that you cannot truly understand how the company is doing.

Anyone able to unpack this for us mere mortals?