thinking thursday, page-107

Hi someone mentioned a few days ago that Larry Williams had said look for a bounce on S+P about July 10, now my understanding is that this call was based on his WillGo indicator my understanding of this indicator is that it is arrived at by looking at Yeilds on T bonds, can any of the wiser heads give me a laymans explanation of how Tbond yeilds could affect the equity markets and how an indicator could predict this a couple of weeks out?

Just curious as his Willgo indicator also had a short entry of 3925 (SPI) prior to the event a couple of weeks ago as well. Would like to know how this would work and how to trade it.
Cheers