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Take some bamboo tree, pull of his nails with a tong then you simply push the bamboo tree down in the flesh.
Then you take needles and stuff em in to the eyeball, cut of his toe nails, blow of half of his nutsack with a magnum.
Kick out the teaths and moth them, spread them out later.
Burn his body in 98% Acid.
Burn your clothes, be sure to use gloves and a robber mask.
Then your done!
Then ofcourse you will have to life with it for the rest ouf your life ^^
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unfourtunatley it's none of your business so just try to console your sister and make her feel better, thats all you can do.
unless you wanna put him in a :stretcher then i'd advise you to fight dirty and with about 20 people with you, just so you can be sure to win ^_^