hmmm... I have a number of co teachers who I considered as toxic. the other one acted like as eyes and ears for our school head and reports immediately whatever she hears inside the faculty. she seems so nice in front whenever you to talk to her but be very careful when you let your guards off. There are so many toxic people whatever our working environment will be and it's better to be aware who they are so that we can deal with them squarely and avoid ruining our day.