Ron didn't have a clue what was going on. Luna in trouble? And Harry was in contact with her? It didn't help that he was still dead tired. He'd been out very late the night previous, attending an unlicensed boxing match in his latest effort to finagle an invite to the high stakes poker circuit and would be doing the same thing again tonight (if Hermione didn't murder him first), so he'd been trying to get some much needed shut-eye first.
Of course, now he was on edge, half-asleep and half-panicked, and only just avoided firing a stunner off at Harry's head when he returned . . . with an apparently unconscious Luna Lovegood in tow.
Ron blinked stupidly for a moment before saying, "Ok. What the fuck is going on?"