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I also am worried about the number of concussions in ice dance. I still have vivid memories of Dubreuil falling on the ice from a lift at the Olympics.
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Yes, I also remember
Marie - France Dubreuil's fall, it was terrible moment.
Charlene Guignard had a bad fall from FD lift at European Championships 2017, she was in a position with head down and Marco was staying on one foot, he lost balance, but happily she avoided hitting the head.
At European Championships 2007
Federica Faiella & Massimo Scali were doing reverse lift in FD - Federica in Spread Eagle with bend knees and Massimo with head down - she lost balance and he fell directly on his head and neck.
All those terrible falls happened because of requirements for levels and difficult positions.
If you are in Spread Eagle or skating on one leg only, you have minimal possibility to fight when your centre of balance moves (especially if this happens fast and you are lifting your partner).
It is ice and there can be hole you skate into, in this case you can fall easily too.
If Patrice Lauzon could use both hands to hold Marie - France, she would not fall. If Marco or Federica wouldn't be in a difficult position (one leg, Spread Eagle) their partners wouldn't fall probably. What "if" does not belong to sport, but such moments lead to rethinking things.
I do understand that skaters push themselves into triple and quad jumps although it is more difficult (and dangerous) than double jumps, they indeed push technical level higher and higher. But ice dance lifts? They are definitely more dangerous than ever before. Much more dangerous then lifts under old system. But are they really worth it? Because Level 4 lifts are no way indication of anything figure skating or ice dancing is about.
I suggest
ICE DANCE LIFTS as another topic for evaluating.
What is its cost and benefit? Why to risk injuries in Level 4 lifts when those elements are not indicating skating or dancing level of the couple.
In case of single skaters and pair skaters it is their choice if they pick triple or quad jump (twist or throw jump) in a routine. The difficulty of the jump is a results of pressure from other skater's level or individual decision of skater to execute more difficult jump. Yuma Kagiyama executed quad salchow and toeloop for the most of the season, but more difficult jumping content of his rivals pushed him to included quad flip into his Free Skate at World Championships.
Level 4 lifts have mandatory requirements and features created by ISU. Dancers may pick features more suitable for them, but they are restricted with number of repetitions for each feature in Free Dance, which is no way helpful. It is their choice that they pick Level 4 lifts, because they want points. But is it ISU choice that they created Level 4 requirements so dangerous.