Bad call, he's got the rule wrong. You'd think if they talked about it at half time they'd have actually looked up the rule.
I actually had an IW this year in a game when I started to make this very call. Both jumpers tapped it on their second swipe, it went down, and A1 grabbed it after the bounce. I hit my whistle and immediately knew I'd screwed up, declared an IW, and gave the ball to A at the division line and flipped the arrow to B.
I hope he at least gave the arrow to A on this, but I'm doubtful since 20 years ago that wouldn't have been the proper ruling.