It looks like this mope couldn't get it to detonate properly and it caught fire. Hence the serious burns he's hopefully suffering from.
This article claims it "is subject to biodegradation in untreated or unpreserved urine and feces." Is there any useful truth to that so that? Would future PETN bombers justify hmm... relieving the passenger problems they caused with locking the toilets an hour before landing? (PBUH) Not that such restrictions would stop the bomber, he'd just go earlier, ready all his smuggled gear and return to his seat.