Iv'e been caving for many many years and started off on SRT from day one near enough and have done a LOT of SRT over the years and that is the only time I've ever had an issue..... of any kind
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Hanging on directly cows tails is something I don't and have never done - they are there as your life backup incase you cock up whilst getting on/off ropes or fail on a change over! I'm sure everyone has their own view of this which is fine; just I only use mine as mentioned when getting on/off or changeovers