Not only them but also principal Carmen Molina from way back in season 1. Yeah, this was the one thing that bugged me about this episode. They were painfully obvious about what they were doing. This completely tore me apart even though I knew it was coming. As you said, she was an innocent caught in the line of fire. I completely agree. My first thought upon seeing Walt's ego firing up at their comments: "This is how Walt gets his fire back."