Interesting one at a development event on Saturday - league match in the middle of what we appoint to, with mid-grade umpires, watched from sidelines by 3 groups each with an umpire coach and 3 umpires, also mid-grade and developing. One incident I saw so differently from the 2 on-pitch umpires and the 3 with me, that I was left wondering whether my mental recall was faulty. I woke up this morning (2 days later) with a possible explanation: when an aerial goes up, look to the landing zone... now! Red aerials down the line from halfway just above the reach of white defender 5m in front of us, bounces to shoulder height of red/white together just inside 23. After slight delay (for advantage, or is this bounce an aerial?), far umpire awards FHD and our sideline umpire appears to agree. Within a minute it is half time and the red attacker goes to discuss decision with umpires - red seems to be (politely) aggrieved; umpires apparently content with their decision. It is obviously a point for our group to discuss, but unfortunately not brought up at the after-game review, where we focussed on themes rather than incidents. What the 5 mid-grade umpires saw (3 in group and 2 on pitch) was the white defender stood ready to receive, with a red attacker almost in contact behind, as the ball arrived at shoulder level from its bounce. The slight delay in whistle was reasonable to see if white retained control/advantage, but the ball ran free so FHD. What I saw (but was persuaded that my mental replay was faulty) was the red attacker all set for the shoulder-level bounce, when a white defender appears square across his face, with enough contact to knock red half a step back. That's not just an approach within 5: it's with a stick passing 6 inches in front of the opponent's nose, and physical contact. I'm ready for a big whistle, probably a card, and a PC as it's inside the 23. Oh, right... maybe not? But not at all surprised that the red attacker went to discuss it. This morning it dawns on me (I think): the 3 umpires in the group and, it seems, both on the pitch, had their attention grabbed by the mid-flight reach up and miss, with possibly some distraction by the thought "He can't... oh yes, he can". When their attention switched to the landing zone, the white defender was stood ready, with the red attacker at his shoulder. I seem to have enough practice at ignoring the flight, and looking to the landing zone, to get there that vital half a second earlier. Estimate of the timeline, assuming the ball reached 4m above the pitch, would have the ball arriving at shoulder height: 0.3 seconds after the bounce, 1.2 seconds after passing above 1st defender, 2.1 seconds after the lift. My recall is that white defender's shoulder contact was just before the bounce, and I saw him run the last 2 or 3 strides, so half a second before arrival. A long post for a 1 second incident, but maybe something to learn from it?