Free throw admin screw up........

[dsimp8]

Here's the situation...Visiting team make a layup and gets fouled setting up a potential 3 point play. Home team calls Timeout. My parter and I identify the shooter so we can have the correct one coming out of TO. Partner is underneath administering FT attempt. I step in and give him a "1 finger sign" to make sure he knows it's one shot. After I do this. The PG for the Home team asks me a question. I then see my partner standing right beside a player on the lane signifying to me that he probably thinks it's 2 shots. The kid is getting ready to shoot so I don't want to interfere with his shot. I just pray he makes it. Well,he misses it and one of his players picks it up and tries to put it back in. I blow the whistle since I know it is one shot.My partner,the veteran above me,says we have an inadvertent whistle so we go to the arrow. He does it half heartedly so he wasn't too sure of himself. Was that the right thing to do?The arrow was in the visiting teams favor which obviously didn't sit well with the home crowd.