Kind of a weird one

[stick]

About 3 weeks ago I was doing a boys jv game. Team A scores a basket which puts them down 3 with less than 30 seconds left. My partner (we were doing a 2-man) is on the baseline and blows his whistle. I go to switch spots with him watching him and waiting to hear what the call is. He doesn't say anything to anyone and runs down to the other end!! I have both coaches screaming at me wanting to know what the call was and I couldn't answer them!! So I motion my partner to come over to explain his call. He said a player on team A grabbed the arm of a player on team B trying to get open for the inbounds pass. Then he ran back down to the other end!! So I got both coaches together and explained the call and that there is no bonus (away from the ball foul) and both were cool with it. After the game I told my partner in a nice way that he should have explained the call, not me. He admitted had a brain fart but for that night I gave him the benefit of the doubt since he's a second year official. Upon reflection perhaps I should have let him explain everything. Any feedback is appreciated. Thanks