Why are we arguing whether or not Boyang Jin has a correct lutz edge? He obviously does. He's practically the textbook example of lutz. We look at the edge when the skater begins to take off, not when they are already in the air, or exactly when the toe picks. Begins to take off as in when the body begins to rotate, but both skates are still on the ice.
In the screenshot Boyang is not in the air. Both skates are still on the ice. His edge is flat. At what point the edge is not relevant anymore, can i just switch to the inside while rotating on the ice ? Since you say we should look at the begining of take-off. Trying to connect the dots
Also, i looked for the info and found this quote
"As long as tap by picking leg is done while the edge is still outside - the jump is legal. What is happening AFTER the tap - have nothing to do with determining a jump. Here is definition of a lutz from ISU affiliated source: https://www.usfsa.org/content/Identifying Jumps.pdf Excerpt: "A Lutz should have a strong backward outside edge BEFORE the skater taps into the ice. " That's it. In practice, considering that noticing exact moment before the tap is pretty hard - everyone assess the jump edge by moment of picking - which is shown in a spreadsheet there too: "Lutz - Take Off - Backward Outside with Pick".
Goncharenko had a disagreement with some Russian tech specialist on the edge call. She told him the call was made at the wrong time, when he showed the moment and explained his decision. She also thinks that Anna's Lutz edge was fine but her Flip was "!"
https://www.sports.ru/figure-skating/1080022717.html?from=main-news-fs
And to me, it all indicates that people are taught in a different way
Here is the official link
https://www.isu.org/figure-skating/...handbook-pairs-2019-2020-final-corrected/file
It says nothing about begining or rotationTaking off from wrong edge (Flip/Lutz)
Flip take-off is from a backward inside edge, Lutz take-off is from a backward outside edge.
If the take-off edge is not clean correct, the TP indicates the error to the Judges using the
signs “e” (edge) and “!” (attention). The TP may watch the replay in slow motion. The TP
uses the sign “e” if the take-off edge is definitely wrong. The Base values of the jumps with
the sign “e” are listed in the SOV chart. The TP uses the sign “!” if the take-off edge is not
clear. In this case the Base value is not reduced. Both mistakes are reflected in the GOE of
the Judges.