Not to mention each forework is in its own compartmentalized container. Taking far longer for them all to go off than if they were all ‘disassembled’ and put into a singular container. And then one that could partially contain the blast until everything was lit. Not all explosives are the same, they have different expansion and mechanisms of which to go off

Haha this is my thought, the shadow man just looks exasperated that he has to yet again close the door. The horror is the vast number of people going through life without regard to anyone else