Thinking about this again.
So when TM/BM/Daughter (not sure who was in the car initially tbh), went to the middle school parking lot. It sounds like EN was there by himself, no car, just hanging out (maybe selling drugs or whatever). It sounds like when he saw the people in the car looking at him too intensely, is when he called for his friend to pick him up.
So that means there was no honking or road rage that triggered anything according to EN,and I 'm not sure why he would lie to his friend, althought it is possible.
Another thing that I can't get out of my mind, is the fact that the ONLY reason EN is in jail right now is because he was blabbing/bragging to friends, and his friends and mom ratted him out, not because BM/The Dad/or Daughter went to the police about him. If EN's friends and mom hadn't talked to the police, the M family would still be out there saying they were looking for spiky haired 6ft tall blond/blue eyed dude and holding vigils.