You just have no idea what is actually going on with this teacher.
I completed my NQT year in year 1 and stayed for a second year. I did very well. Everyone was really happy with the children's progress, so the Head - in his wisdom - gave me a year 5 class the following year who were notorious for being a difficult class. At the same time, he decided to theme all of the planning, so we started from scratch (I had never taught in year 5, so that was difficult in itself). I was also given a core curriculum responsibility and was in charge of all the ICT (teaching and technical support). I also had a student teacher to mentor and 3 after school clubs to oversee (I was music co-ordinator too).
It was way too much. I did my absolute best, but it was completely impossible. The class (many of whom had not made progress since year 2), had completely got out of the habit of working. They didn't want to do anything. No matter how much I threw at the lessons to spice them up and get them interested, they had to be dragged kicking and screaming (literally at times) through every lesson. They were more interested in arguing with each other.
After the first half term, the Head decided to give them a fresh start and mixed up the two year 5 classes to make two new ones, but gave me no time to get a handover from the other teacher. No time to set up systems, reading folders, Assessment data, books...anything.
I worked so hard, but things started to slip. I know for a fact that I wasn't giving the children what I needed from them. I wasn't keeping the marking up to date. My hair fell out. I lost tonnes of weight. I was sick every morning on the way to school.
After a couple of unpleasant incidents involving the Head appearing in my classroom demanding to see my books and calling me in to his office to berate me about being behind with my marking, I had enough and ended up in a psychiatric unit.
..and now I think there may have been parents gossiping about me failing their children at the school gates. The parents would have no idea what I was going through. They would also have no idea how the dynamics of that class were having such a bad impact on the children's learning. They just didn't get along and could not focus on anything for more than a few minutes. I was two years into teaching - and had been good with infants. I was way out of my depth.
The Head has since admitted that he failed me by putting way too much on my plate, but the damage to my confidence has been done.
Please accept that the Head is probably aware of any difficulties, but will not tell you exactly what is happening with an individual teacher. I have long believed that confidence is vital to teaching and, if it takes a bashing from something like this, it can have a downward spiralling effect on the standard of learning in a classroom.