Why doesn't that happen more often ?

If you walk along a busy street you don't bump into people constantly. Instead you subconsciously catch the eyes of people approaching you and somehow transmit a message enabling evasive action to take place. Occasionally you get a situation where you almost collide and then both people move in the same direction once or twice more before you eventually pass. It's always because one of the two was looking away or, more usually, down and no eye contact was made.

Now it seems that Bell and Prior had a moment like that yesterday and Prior was run out as a consequence. So it occurred to me that with batsman watching the ball and fielders as they run between wicketes it is surprising that it doesn't happen more often.

Obviously we know that the non-striker's position when the ball is bowled is determined by what side of the wicket the bowler is operating from and the striker presumably takes that into account in his calculations but I wonder if there is more to it than that.