I recently unlocked Stringing Pummel, then I discovered that when my automaton WSed Magic Mortar - my SP created a Gravitation skillchain . . . and I was like OMG! Wow. Now that's damage! So then I think, hmm, magic burst - let's try that. So after about a dozen attempts I think I don't know wtf I'm doing.
I'm not getting any message that I've created a magic burst (don't know if I should be); the damage I'm getting from the blue magic spell is meh. I don't see any cool animation like I see with the Gravitation skillchain. Am I expecting too much of a sub-level magic burst? Am I mis-timing something? My actions are (1) wait for automaton to WS magic mortar; (2) hit Stringing Pummel; (3) hit job ability, burst afinity; (4) trigger blue magic spell (tried Blood Saber, Death Ray, Digest, Blood Drain) - I think my top damage from the blue spell was 80ish.