According to Einstein, the force of gravity keeping your feet on the ground is fundamentally identical to the forceslamming your body forward when you hit the brakes on the highway or take a sudden sharp turn.
Not long after, in just a matter of minutes, the tide came roaring back and hit the barriers along the Galle Face Green with such a force that there were walls of water over 15 feet high shooting over the barriers and slamming on the areas where the people were standing not two minutes ago.