New category - Islamo-fool.
Hmmm... The timer is connected to the detonator. Huh? Where's the delay box? Isn't there supposed to be a delay box? Wait, here's the delay box, but it's wires go... [fumble, fumble] right back to itself. No wait, that can't be right... I think he wired it wrong, the delay box was supposed to be in this circuit here. I think there's some sort of mistaBOOM!!!!
The bus bomber. He may have been looking for the connection between the trigger and the timer, to satisfy himself that he would have time to get away. He may have been suspicious of the location of the tube blasts, i.e., they didn't fit the training plan, but suggested premature detonation.