I don't know much about explosives, but I'd think the obvious first question to ask is where is the stuff that goes boom. Wires may overheat and burn, but they don't go boom. Resistors and capacitors and such may go pop if they're overloaded, but they don't go boom. ICs can burn, but they don't go boom. Circuit boards don't go boom. So where's the boom?
Now, if he had brought in a pressure cooker, that might be a different story. But how many people would be scared of a pressure cooker?
Now, if he had brought in a pressure cooker, that might be a different story. But how many people would be scared of a pressure cooker?