no...most people inexperienced with a knife will stab, take a few armed combat classes and you will learn that.
if they are trained...they use it only for defense until after you strike (and get cut by the block) or in the case of aikido...well its still considered defense as there are no intrinsically offensive moves in the style, the knife "just happens" to be in the right position at all times.
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going to mexico :D
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