You can see where he went 2 off on right and then overcorrected which led him to go sidesways.
Edit
Just saw earlier post that mentions Z driver in the mud. I agree he was too concerned about letting others pass he didn't keep his eyes ahead.
But I don't agree that Z should've pointed outside. Points traditionally are inside of turns. Though I'm not familiar with this track, he seems to be taking the right line. He lines himself up with the curbing to take a late apex. That appears to be the correct school line.
Maybe the racing line is to take the inside but for DE (or non-race as you call it) why would you expect him to hug the inside? So to say this could've been avoided had he stayed on the racing line doesn't seem applicable here.