Ron jumped in surprise and had his wand half raised before Hermione's voice and words fully registered and he rattled off the answer to her pass question without missing another beat, "Gray sweater. And you didn't spill anything, Harry was the one who bumped into the table and spilled juice on you. That tomato-y Muggle drink with the stupid name and the fruit in it you always make me get."
Ron paused, frowning in concern at how obviously tired she looked. She needs to get more sleep. Instead of saying this, however, he asked, "Where's Harry at? I've got news."