|Point to all fly balls. You never know|
when a teammate will need that help.
Regardless of the reason for not picking up the ball, everyone in the infield should point to fly balls in order to help their teammates find the ball more easily. If the fielder does not see the ball, he can just look at everyone's arm and follow them right up to where the ball is. Of course, if the fly ball is hit and a fielder has to go for the ball, he would not be expected to point to the ball as he runs. This would slow him down. Everyone else not involved in the play should though.
You never know when a fielder may need this kind of help so everyone in the infield should get into the habit of pointing every time.