I have heard it said that what is difficult to grasp in life is that moment when a thing that was before you becomes a thing that is behind you.
An old friend once suggested something similar: ‘What the eye doesn’t see the foot suffers,’ he would intone sagely.
You concentrate so hard on things in life. You watch things so carefully, surveying the scene and your place in it, looking after yourself and those around you.
Then, in a second, the very outcome you did not want is real. You look behind; in front. Events have taken over again.