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Must confess when mine went I got no warning whatsoever. I was in full flight and it just felt like it snapped, (it probably didn't actually snap I wouldn't have thought but it felt like it). The pain then was like someone sticking a serated knife into the back of your thigh and gouging it round and round in a deep circle. Not pleasant, and like I say you don't walk off with that. Not unless you're very tough anyway lol.