Backstabbing is a special attack for thieves and the Ratkin are a thieving race. If you have a thief in your party they can get damage bonuses by backstabbing. Nobody else can do it AFAIK and your thief loses the ability if they change class. I think the backstab attack works automatically (not sure, I haven't taken Miles in ages and I never put a thief in my party).
How it realistically works is anyones guess. I can only assume the thief is able to use the "look over there" trick every time.
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