If you throw a stone into a lake, the ripples move in all direction. They
move back towards you and forward away from you. If the stone is big
enough, the ripples may disturb something far away from you.
Events are like that too. the event can change how you see the past, and
the event can disturb the future too.
We are constantly throwing stones into Time, constantly disturbing the
surface of it, and changing the réflexion that we see when we look into it.