The situation with Midori was pretty clear from the start. Once you got that flashback obvious that her families reaction to her abilities helped shape her direction. Makes sense since most people are deeply affected by how others view them. Ran got strong support from Rui and her brother which allowed her to stay on that path. Without them could have easily turned into someone very different from normal.

I think the teacher let the girls have the heart to heart since it was pretty entertaining. Thought she was almost clapping there :). But is quite nice when the enemy lets you relax and talk.