the fellow who went up to the floor above (3rd?)
had gone up there to practice a speech. He was the
one who perished, from what i heard. The others on
the floor below (2nd?) were all rescued.

I can see how if the people were dancing it might put
extra stress on the bldg. Like that thing that happens
when soldiers march across a bridge--they "break cadence"
so the waves from their marching do not amplify and damage
the structure.