Yeah but she just appears, moves around a bit, and runs away. Piano bomb sounds like her second job, ranged 3 MP skill, and there's no way she'd use that in Cuatal temple, since she's in 1st job there.
Oh well. I'm kind of dissapointed that Mercenary's coming before Ryan, but either way, Ryan can't be far off now. I really doubt they plan to release Lass' 2nd and 3rd back to back, although if they did, I might have a reason to actually use him again.