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Breakaway torque is the rotating force required to break the head loose, going in the same direction as applied-tightening. This will usually give a value HIGHER than the original tightening torque because dynamic (when the bolt was tightened) is lower than static (when you try to break loose the bolt head). This is how it is defined by torque testing standards. If the breakaway is measured in reverse (loosening), you will usually get even higher readings because the bolt head generally digs in and forms small burrs and indents THAT ARE DIRECTIONAL-like a ratchet. It is incorrect to check breakaway by loosening.
An impact driver is a manual or power tool that delivers a strong, sudden rotational and downward force. In conjunction with toughened screwdriver bits and socket sets, they are often used by mechanics to loosen larger screws (bolts) and nuts that are corrosively frozen or over-torqued.