He was already canceling the extra mass, even before he registered something was wrong, and immediately guessed that the mage he had seen had somehow managed to 'sidestep' out of the way. He dove to the side, away from Frost, his peripheral vision telling him he wasn't to the side, almost before he heard the mage behind him. He came up from the roll, having been clipped by the force wave but not thrown, and whirled, bringing his revolver out and putting four neat shots into the chest area of the target.