yelling alone
While yelling alone won't make an assailant drop to his knees and beg you not to beat his ass.......studies have shown that a good yell while attacking an opponent can help direct more force into your punch or kick.
It seems to mentally unbalance people as well but yelling alone won't save your ass unless you are Donald Trump in a board meeting and you're yelling "You're Fired" to some corporate ass kiss.
Or your chef Ramsey calling some f-up a "Donkey".
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