Dollar under a pyramid

In Malcom Gladwell's book Blink he talks about a challange where a 100 dollar bill is under an upside-down pyramid that is perfectly balanced in such a way that the slightest movement will cause the pyramid to tip over and the challange is to remove the bill from under neath the pyramid.

When I read this challange my answer was you just grab the dollar because even though it's under a pyramid the challange does not say that it's under the tip of the pyramid, however my answer was wrong, if it was a riddle about how someone had solved this dilema and the point was to figure out how my answer would've worked however this was different.

The "correct" answer is to destroy the 100 dollar bill by either tearing it or burning, the point of this riddle is that it shows us we are assumeing that we want to keep the 100 dollar bill to spend, but still I think my answer works better and I explain why.

What makes this challangeing is that the slightest most infintesimal force will tip the pyramid over, but under this condition neither answer would work. Tearing the dollar means applying force to the dollar which consequentially means applying force to the pyramid, and you could never destroy the whole dollar this way because the thickness of your finger would get in the way of getting to close to the tip. Lighting the dollar on fire doesn't really work either because the smoke from the dollar burning is also a slight movement that would tip the pyramid.