Going along with what Steve said, I would only point if the ball comes out or is on the ground. I'll point when the 1B has the ball trapped, yelling "Trap! Safe!" In coed slow-pitch, if I'm working the bases, I always point when there's a potential double play, and they get one of the outs but not the other. For example, they get the runner going into 2nd but fail to get the runner going to 1st. After I've made the safe call at 1st, I'll point back at 2nd and signal the out again just to make sure they all know we've got the out. (Like I said, COED only!)