Which driver "dragged her 30 or 40 feet"? I assume not the first or he wouldn't have stopped (or said he only "heard a thump") was it the 3rd guy who drove off?
" And why didn't he block her from oncoming traffic while he called 911???!!!!!"
He probably pulled over, then what, you mean stand in the middle of the road? Given what happened to her, I think standing in the middle of the road trying to wave cars to the side might have worked, or we might have two bodies, especially since the 3rd driver dragged her 30 or 40 feet and drove off. (I'm assuming the driver that dragged her was not one of the two that stopped, though the article doesn't specify).