Photoshop :: How Multiple Blur Traces Utilized In Shake Reduction

I'm starting to get fairly comfortable with the new shake reduction tool in CC and the results are fantastic.  It's already saved several old photos that I had given up on as hopelessly motion blurred.  Now that I'm getting familiar with the tool though, I have a question.  I know the tool allows for multiple blur traces to be created.  How are they used, and won't they conflict with one another.  If part of the image is more blurred than another, or blurred in a slightly different direction, won't the corrections applied from the blur trace determined by one part of the image actually further blur the parts of the image where that blur trace doesn't apply (and isn't the same true of the second trace then)? how the tool handles multiple traces?  Are they applied locally with diminishing effect as the distance from the measurement region increases?  Are they applied in some other smart fashion?