Though it may seem like Grant might have pulled on the blanket. This is a hard case to actually prove. If he indeed pulled on the blanket then the top part of the blanket (left side of the screen) would have crunched up more. As you can see, it doesn't move And you would have seen MORE movement at the feet from the hand.
And it isn't so much of a pulling of the blanket, it was more of a sliding or gliding motion, and seeing which part was actually 'grabbed' it could have easily crunched up like that and not folded over.





