As Flitwick went to rouse those Ravenclaws not yet in the Room of Requirement, Harry and Cho headed quickly back in that direction. After the way their brief relationship had ended back in his fifth year, Harry was frankly surprised to see Cho here and even more surprised at how protective of him she had been back in Ravenclaw Tower. There was something troubling him, something he couldn't quite put his finger on. Still, he forced those thoughts aside. He had to stay focused on the task at hand.
It took Harry a moment to realize that Cho had stopped. He turned to see her looking out one of the corridor windows. He had forgotten how beautiful she was or perhaps he had never seen her like this before. He remembered the pretty girl, shy, friendly, perhaps a tad dramatic at times. He remembered how nervous she had made him, how something had seemed to catch in his throat every time he saw her. He remembered how miserable and angry he had been when they'd first broken up and then how his feelings had seemed to fade away or at least to recede into the background once he knew it was really over. He remembered all that but he was taken aback by this woman who had every reason to hate him and yet had come back to risk her life for him. He shook his head. He was being silly. She must be back here for Michael or to avenge Cedric. Maybe they could finally be friends but that was it. He took a step towards her, "Is everything alright, Cho?"
"Harry, look," Cho said quietly. She didn't sound afraid, not exactly. She sounded more amazed than anything else, as if she couldn't quite wrap her mind around what she was seeing. Harry felt a sudden urge to protect her. He would feel it for anyone, wouldn't he? Certainly for any friend and member of Dumbledore's Army.
As Harry stepped back to join Cho, his eyes widened. Out the window, he could see the silhouettes of what must be a dozen or more giants rising out of the Forbidden Forest. Wizards and Witches on brooms were circling above. Harry counted three dozen. Milling on the grounds, he could see hundreds of trolls, shifting anxiously, ready for the attack. They were too stupid to be properly hidden and only the handful of Death Eaters commanding them kept them back for now. Dementors were everywhere. Harry thought there might be thousands. That, of course, was just what he could see. He could imagine the Wizards, vampires, werewolves, boggarts, basilisks, acromantulas, and other dark creatures still waiting under cover of the forest. Without thinking about it, Harry wrapped an arm around Cho's shoulder. "It'll be alright."
Cho reached up and placed her hand on his for a moment. Harry found it comforting. He almost regretted it when she pulled away and started once more for the Room of Requirement, "We need to hurry if we're going to face an army like that."
Harry nodded and ran after her. As they came to a stop just outside the Room of Requirements, Harry turned to Cho, "You know, we never really got a chance to…"
Harry imagined that Cho had been starting to smile when Bill and Fleur Weasley burst out of the Room of Requirements. Bill grabbed Harry by the shoulder, "There you are. Thank goodness. Harry, everything is starting to move very fast. There's been fighting in Diagon Alley, fighting in Azkaban, fighting on the continent. The Chief Death Eater is putting everything he has into the area around Hogwarts. This is going to be the central front in the war. I have to find McGonnagall."