"No one came to help except one of my friends, who helped pat out the fire as I ran out the door.
"The shirt had been burned on to my skin, so when I ripped it off, it tore my back off too."
The Parole Board acknowledged the progress Shannon had made while in prison.
He completed a six-month Drug Treatment Unit programme in April.
"He acknowledged that when he offended, he was dependent upon cannabis," the parole board decision said. "He now has strategies in place for dealing with that."
The board's report said that Shannon had "grown up" and taken responsibility for what he did.
"For the first time he has been able to talk about the issues in his background which allowed him to offend in the dreadful way that he did.
"He has undertaken counselling which has assisted with this, and he is aware that he can apply for ACC counselling at an appropriate time.
"However we are not satisfied that he has reached the point where his risk is not undue."
The board supported a slow and careful re-integration, including temporary releases and taking part in the Release for Work programme.
Shannon's sentence ends on 11 September, 2015.
It is the second time his parole has been declined. The Board will reconsider parole for Shannon in November.