Do you all think Bill's fall has him paralyzed?
No.
I think he was looking up at the heavens, and the stars, and saw not only the Darknes Barb feared, but the perfect order of his god, as represented by the stars (there is a Mormon term for that but Alzheimers has stuck). Edited to add -- is it called "Celestial Kingdom"?
I think this was Bill having an ephiphany, not only empathizing with his first wife, but sympathizing with his second and realizing there is more to lose by divorcing Nicki than there is to gain. I think this is Bill feeling some deep emotions and connecting those emotions to his religious center which will translate him next week to act to save his family.
But, unless I miss my guess, the seeds of tragedy have already been sown. Someone close to Bill will die (my bet is Joey as it would be more tragic), causing him to experience pain at the moment of his acting out his epiphany.
Or it could all be some incredible coincidence.