He notices Ned's blush, but that's only because he's an inveterate blusher himself, and picks up on it easily in other people. He's not unkind enough to say anything about it, though; he hates it when people notice him blushing, and has trained himself out of finding most things embarrassing. Most. There are still certain things that will cause the color to rise to his cheeks, and he vaguely wonders whether that might be the case for Ned, too. He won't ask. That would be rude, and rude is exactly what he's attempting to avoid.

"You mean you were... attacked by more than just me? Er... us?"

He doesn't intend to apologize for Charlie, but he does have to acknowledge that to some extent, the attack on Ned had been a joint effort. While Meyer hadn't approved of Charlie's impromptu kidnapping of Ned, it probably wouldn't have happened had Charlie not been out looking for Meyer in the first place. He's exceptionally good at accepting responsibility for things that aren't technically his fault.