AT&T to the rescue!!!

[rockyroad]

I think I would have hit the whistle, run over to him and said "Hey, that ball got knocked out of his hands by the defender, so his second dribble was legal. You couldn't see that from where you were at, so I've got this one for you." Then simply turned to the table/coaches and signalled it was A's ball - if coach wants an explanation, I'd give him the same thing I told my partner...

No long discussion with him/her. No argument about the rule...just step in, state what you've got and put the ball in play. If they want to rehash it after the game, great - I'll let them know exactly what I thought of that call and them making it from where they were at. This is one of those times where protecting the game is more important than worrying about hurting my partners feelings.