"TATP" is known for premature explosions also. He might have been resting/waiting for halftime/adjusting vest????
From the Net:
" Used alone, Mr. Davies says, TATP is favored only by the foolhardy.
>> The concoction, which he
>> describes as the "explosive of last resort," is easily mixed -- it is
>> known as a bathtub explosive -- but
>> less powerful than plastic explosives and far more volatile. Commonly
>> employed by Palestinian
>> extremist groups such as Hamas, TATP can be set off by random sparks
>> and sudden movements. "It's
>> very sensitive," Mr. Davies says, "and it's the main reason these
>> Palestinian groups have lost so many
>> bomb makers over the years."
It must also be considered that in fact, the instructions he was using were bad.
It has been widely reported that the Israelis put up websites that showed how to make bombs that had deliberate errors that would cause the maker to be blown up while arming the weapon.
This incident has certain similarities.
Cheers,
knews hound