One More Brother

"Why would Harry ask me to kill the snake?" Ron's stomach dropped. He heard Hermione release a soft gasp and he didn't have to turn to know there was a look of horror dawning on her face. Harry wouldn't. He promised he wouldn't. Merlin, when had he even left? Or: The moment that we miss in the Deathly Hallows, when everyone realises that Harry's turned himself into Voldemort.