Things were going well in the fight, or at least they weren't going bad, but George had little hope. He couldn't see his opponent, had no wand, and was most likely no match physically now. His only hope came when the lift slowed, it meant he might be able to run, but he was knocked back and put under the imperius curse before he could do anything.
Now he was only left with his mind which was scared shitless at this point. There really was no way back and instead of doing simple recon for a rescue mission, he'd gotten himself caught. So now he was an even bigger hindrance. And he might be dead soon.
That's all he could think: this would surely lead to his death, if not just extreme torture. Or Azkaban. Or being a slave. The possibilities were endless and he had no way to control them.