There is no encounter at all, this is the most interesting part now since we this lecture of few minutes, I will discuss that little bit just spend this is, this is the most dangerous and most important situation that comes; you are moving this side waves moving this side you are very happy, you think that it is like hydrostatic nothing is happening, but you know this point water is moving you are moving and there is basically no grip.
And it is, this is the case what is called following waves where ships capsize having high roll, because it is just like you are try to walk on a skate, you try to walk on a floor which is very very smooth so you walk, but the relative speed is 0 where you fall, because there is no grip or you can try to walk on that thing where the floor is moving, you are also move in same speed.