Follow the jump from its beginning
FIVB permits the specified back-row attack above net height when take-off is behind the attack line without the feet touching or crossing it. Landing in the front zone afterwards does not make that a front-zone take-off.
A player jumps from clearly behind the line, strikes in the air and lands well nearer the net. A replay paused at landing can wrongly suggest the attack began from a prohibited place.
Use three frames
First locate the final ground contact before take-off. Then inspect the airborne hit and its height. Only afterwards note the landing. The last frame is visually dramatic, but it answers a different question from the first.
This distinction helps explain a legal back-row attack that carries the player a long way forward. It does not permit a foot on the line at take-off or remove other attack restrictions. The example holds the flight path constant while changing the starting foot position, showing why distance travelled in the air is not the same as where the jump began.
Questions answered
Does landing in front prove a front-zone take-off?
No.
Which frame should the replay preserve?
The final foot contact before the jump.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.