User blog comment:MetallicArcher/Fabulous Blake!/@comment-49.145.13.85-20140716160137/@comment-3146930-20140717091310

Aura seems to be pretty much the same from one person to the next, acting as a type of shield to protect them from harm. As shown with Ren however, some people can use it in different ways like focusing it in one spot for a stronger shield. Maybe Blake can extend hers out from the end of her weapon to make those purple slashes.