Fracture and foresight both suck on GLA so if you are thinking like me and think this will help you solo, dont bother.
You have to parry to pacify them, and when you do you have to hit them (obviously), but even then it lasts all of 2 or 3 seconds. IMO Useless as a cross class skill because they hit you, you parry/fracture, they attack once, then hit you with weapon skill because fracture wore off already :/
Side note, I thought the time it took to take MAR from 10 to 14 would get me out of surplus ****, but no. still getting 30 or 40 sp while my team mates get hundreds. could switch over to thm or con which are both also around 20 but my stats are physical now. YAY square, thanks for makeing this so fun. Now i party with my friends and dont progress, level another job and cant party with friends, or party with gimp stats. awesometabulous.