The problem of injuries due to shark attack can be prevented to a large degree by wearing the proper clothing. Stainless steel 6 in 1 chainmail is an excelent choice. Make sure to get rivetted or welded chainmail. Butted ends are only good for show.
Donīt worry about injuring the shark. If it looses some teeth it will replace them in a short time.
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If it isnīt broken, it doesnīt have enough features yet.