Very true, SL can screw you up as they wish and you are a sitting duck. Mine threatened teachers that he has the power to close a department and had done it. At the end of the day some SLs only care about how they themselves are rated so they manipulate things to get everything to checked and balanced. Mine makes things difficult for the more senior teachers to cut payroll by replacing with young ones. He expected compliance and was such a control freak. Fortunately for me I was able to do what I enjoy, teaching in a greener pasture overseas.