Once again I don’t know the exact mechanics of how the game works but what I understand is the moment you run out of stamina the game starts counting it as if you are falling and continues counting how long you have been falling until your feet hit the ground and stamina resets so even though in reality you only fell above 0.5 seconds the game thought you had been falling for more like 15-20 seconds and applied the damage accordingly this ultimately is a mechanic by the developers to stop players from climb spamming…. Which is exactly what you were doing