It is in "terrorism for teenagers"
that you let off a bomb in place X and another one where you think all the crowd will collect and gawk ... and cause secondary damage
standard IRA operating policy
all the Brit pit-bosses ( floor mgrs ) in the twin towers had nil mortality as after the first plane they sent the work force home - and also I dont think there were many pit bosses who were Brits to be honest
Hollande was also planning a lock down so there is no point in abandoning a game and turning them out onto the street .....