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Swavek said..
Good idea to check the knife, however there is always kite safety leash release to free yourself of the kite entirely (or remove your harness under water if that fails)
Your kite's safety systems will be useless if lines wrap around your body and the kite starts pulling. This kind of scenario is rare but can happen!
Here are two scenarios that may cause lines to wrap around your body that I've experienced myself and seen happen many times:
1-you crash your kite in the power zone after a water start and continue riding towards it at speed with slack lines, you then sink through your lines
2-Poor boosting technique in poor quality (very gusty) winds. you take off at speed too far downwind while sending the kite over your head, kite falls down with all lines slack over your head and lines wrap around you.
Plenty of other examples when a hook knife is essential, such as someone else's lines get caught around you, lines caught around an object, etc.
So many kiters don't even know hook knives even exist, and the main reason for this is Instructors don't even show it or talk about it in the lessons

Most instructors teach without a hook knife on them which is also unacceptable.
Kiters have died from lines tangling around their body before. Hook knives can save lives but you also need to have the reflex to reach for it and use it in a crisis which is another problem.
Christian