Bard and Machinist should have a limit break indicator.

[AskaRay]

Hmm it goes whichever way you are facing. Which... can be hard to aim on certain bosses.. sometimes I've shot it... had my character randomly turn 90 degrees right at the anime lock... saw the animation go off, firing in the wrong direction, but the boss still got hit for the max dmg.

Other times, I've seen the beam directly hit the boss.. but no damage occur... its buggy.

My favorite time was during Arboretum, I lock on the boss, line it up, fire...and at the last moment I was charmed and I start running towards the the sprout as it fires :'(
No boss damage.