In this TA relies completely on random lines, geometry says to go home. I wouldn't do anything based on this, even I were a mad bear with loads of money that burns holes in my little polar house like a VW diesel exhausting its fumes into it. Maybe I will TA myself after this to tell if I am sane or not.
Anyways, go get a life, there is nothing to understand from this graph (or any of other graphs to that extent).