[littleharbour]

He could have been referring to the shock wave. The flags were fairly docile and then fluttered rapidly after the blast.

[cuban leaf]

Yep. And there’s the rub: he could have been talking about a lot of different things.

[firebrand]

He could have been referring to the onrush of people trying to help. Didn’t the second bomb go off when the rescuers got near it? And isn’t that a time-honored terrorist trick?