I think that someone had to go in and manually do something to make it happen.

Oh, I should also explain that one theory of mine is that buildings libel to cause epic catastrophes if they collapse sideways can be outfitted with the means by which to demolish them even as early as their initial construction. However, allowing this to be done by remote control is a risk they would never take, so it takes a crew to go in and enable the emergency takedown.