The apartment block itself began to shake: small movements at first, as if the building was being tweaked or prodded. Then bigger undulations, but gently done; rhythmic movement from side to side. At first it affected their balance and they staggered slightly, but as it grew more rhythmic it was easier to stay upright.
A slight judder accompanied a tearing noise and the sounds of falling masonry. And with each subtle movement, with every flutter and sway, the apartment block rose slowly up into the air.
The silence that gripped them all was a concoction of shock, fear and awe.