Sell the call?!

[jumpmaster]

Situation:
Babe Ruth 13 year old league. Bases loaded, no outs, ground ball to F6. F6 throws home for the force out, I am set up in the 1st base extended position. Throw is high, F2 jumps and catches it, but when he comes down his feet are straddling the plate. As he attempts to make the tag on R3, the ball pops loose and drops to the ground. I call safe. From the location of the ball on the ground, I think that the only people that could see it were myself and the 3rd base coach.

After the game my partner tells me that he thinks I blew the call, the kid looked out by a mile. I told him what I had seen, and he backed off and changed his tune. He said that I need to "sell the call...call 'safe, he dropped the ball', that way every one knows why you called the kid safe". My partner has a reputation of talking TOO much. He has been pigeonholed into calling lower level ball because players, fans and coaches complain about his non-stop talking. I don't have a problem with selling the call on a "ringer" but IMO, there is no need to go explaining a close call. If the coach has an issue, he can come talk to me. I am also aware and understand the "expected call" theory. (I learned this one the hard way during FED ball) )

So, what is the proper way to "sell a call"?