An experienced martial artist will tend to shake hands with the other below their shaking arm. Traditionally this is to show that you don't have any weapons in that hand.
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Guide to Deduction
Non-FictionNo copyright intended. Simple day to day things that help with deductions. No longer will you miss out on the details that explain the attributes of a person. Credit goes to who ever made these deductions up.
Martial Artists #2
An experienced martial artist will tend to shake hands with the other below their shaking arm. Traditionally this is to show that you don't have any weapons in that hand.