Don't worry, everyone was evacuated before it fell.
There is a word for what high level kendoka do to create an opening, and that is kuzushii. It is often translated as unbalance, or unsettle, but it can also mean demolish, give way, break, cave in, etc. It's a very cool looking kanji as well, made up of a mountain sitting on top of two moons.
Exactly how you create this kuzushii in your opponent is what kendoka spend their lives studying. But I think the image of something like the picture above happening inside your opponent is a good one to have. b