the body, ari doused it with more diesel fuel than the fuel filter would have held. then used a more flammable accelerant to propel the fire. he wanted to make it look like the truck broke the fluorescent light, creating the spark that ignited the fire, but that's not what caused the fire. the circuit breakers were off. so there was no power going to the light. he most likely used a match. and the amount of fuel on the body was inconsistent in amount and makeup from the fuel held by a truck's fuel filter. ari clearly didn't realize that fire doesn't destroy everything. justin's teeth didn't resemble ari's, clearly proving ari wasn't the victim. but the case was far from over.