Browyn is in shock after she finds out that the police arrested Nate for Simon's murder. Her first thought is that he never could have done it. She immediately leaps into action and calls a pro bono lawyer that had been following the case. She is determined to get him to represent Nate in the case.
After Nate was arrested, the last 3 of the "Bayview 4" brainstorm who else could have done it. Cooper's boyfriend Kris brings it to their attention that it could've just been some kind of twisted suicide plot. That's when everything clicked in their heads and they knew thats exactly what happened.