I think it could be helpful if, per say, there's poison in your body- you can cut off circulation in that area or something of that nature so it doesn't spread. I'm sure it can also work as a tourniquet. I don't know if these uses would be recognized though, since bloodbending has been used for negative purposes and earning a bad title. I mean, the Fire Nation is still trying to rid themselves of their bad rep, yet there's so many parent killers..
Well,it could be used to avoid deaths in battles by controlling the opponents.Anyway,to imprison someone is better than killing.It also could be used for healing.
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