For all she knows about physics, her cup should take approximately half a second to touch the ground and shatter in pieces.
Time is relative, when you see the impossible.
Henry is right in front of her, sitting on a bench at Granny's, and time extends.
The moment she sees her son – the moment her fingers leave the cup – the moment when the noise of broken china reaches her ears – the moment Henry lifts his head – the moment her heart breaks.
He looks right through her.
She was expecting a scream, a smile, a hug.
She gets a blank stare.