There is enough blood in the human legs to enable "choking" via contricting the circulation...In the martial arts I train in, there is a kata where one traps an attacker's kicking leg, and clamps down on it, fairly high.
Having had it performed on me, I can assure you it leads to rapid unconsciousness.
A device similar to what I have described (a small chain or rope with weights at both ends) can be concealed in one's hand, yet give an additional 2 1/2' or so of striking distance.
I have shredded many a dead tree with such chains, so I can vouch for their striking power.
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