Ron made an unexpected movement. Harry reacted instantly, but before the wands flew out of their pockets, Hermione raised hers. "Protego!" she shouted, and an invisible shield separated her with Harry from Ron - the strength of the spell caused all three of them to step back a few paces. Furious, Harry and Ron glared at each other through the translucent barrier, as if they were first truly seeing each other. (p.s. you’re Harry.)