Zack Wallace said that Jade Carlson ran back because she was suffering from a drug relapse.
Jade wanted to try some of Evelyn Willard's private stash of high-end drugs, and afterwards it seems she had hallucinations during her drug use. She turned on the kitchen's natural gas, and just by chance, the loan sharks looking to collect debts arrived, the group of them lit fire outside the door to scare Evelyn, not expecting to ignite the natural gas within the house, causing an immediate explosion. The fire surge was unstoppable and impossible to extinguish.
As for Evelyn Willard, the dispute with Jade seemed to be drug-related as well; the police also found drug-laced cigarettes and injectable drugs in Evelyn's bag.
Zack's statement matched the police investigation results very closely and was corroborated by relevant evidence.
Yet Purple Summers found it hard to believe.
It was just too coincidental that Jade wanted to tell the truth just as her drug craving hit;