Each wall falls in turn, like a really big domino rally, until finally one doesn't.
That wall, as it turns out, is the western most facing load bearing wall. The one underneath which Mike has set up his domicile.

Just as the rumble from the building begins to quiet, a cat screams and runs away and there's the tinkle/crash of one final piece of glass.

Mike looks up through the dust and gloom towards the front door, where a soggy Toph and Sokka stand.

He blinks a couple of times, and then begins to slowly clap.
Mike rises to his feet, applauding, because...what else could he possibly do?w