What is the fastest way to kill a man from behind without using a gun?

Sr-71 to the back of the head

would be cool to cut someone head off with a saber or something

get a nine inch long steel bar. m2 drill rod is nice because it is already hard. grind a point. stick a handle of some type on the other end, make sure to have a robust hand stop. you want six inches of spike sticking out. get fiberglass auto body repair kit from auto parts store or walmart if you live in burgerland. spray steel with mold release or rub with wax. wrap resin soaked fiberglass cloth tightly around spike. leave 1/2 of the sharpened tip sticking out, but make sure some of the glass is following the curve of the ground point. roll especially tight in that area. after hardening the fiberglass grind a taper in the ppint are of the fiberglass to follow the contour of the sharpened point of the spike. make sure the glass can slide off of the weapon easily. leave most of the fiberglass rough. fabricobble a sheath of some sort to house your weapon system. approach victim. visualize the heart of your enemy, (hope you read up on some anatomy.) stab spike up through diaphram into heart. withdraw spike leaving fiberglass straw in your victim's heart. exfiltrate. dispose of spike destructively if possible. burn/melt handle, grind drill rod into unrecognizable trash. if that isn't possible wipe prints with absorbant cotton towels and alcohol, then dispose in trash or river. ponds are a last resort because they're too easy to dredge and whatever you throw in just stays forever.

crossbow

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Boot to the head

thx

y tho
did their dicks even look like that?

A powerful stab directly into the space between the top of the spinal cord and the base of the brain.

Plastic explosives detonation.

Just fucking punch through his head.