"You told her to . . ." Ron cut himself off before he could really start laying into Harry. He'd taken a risk, yeah, but it wasn't as though Ron hadn't taken more dangerous gambles himself recently. Seeing as this risk may have saved Luna's life, he wasn't going to make too much of a deal about it.
"Look, not important right now. Any idea what's wrong with her? 'cause she really doesn't look good. And we should get her inside the tent, yeah?"