Have you ever experienced "the wave" at a ballgame? Or, maybe it was a beach ball passing around. One person starts it, causes it, gets the ball rolling. We all become the effect of it. And the next cause.
You can see the energy visibly move around the stadium, until it comes to you. Then you have a choice:
You can help the ball along, dodge the ball, or let the ball bounce over you.
You may not even be aware of the ball until it bops you on the head. Didn't see that one coming! The ball goes off in an unexpected direction, and your surprise radiates out, too.