[RMXP] Enemy action trouble

Greetings.

I'm making a supposed-to-be-the-badass-boss for my game. But, at some random turns, it won't make a thing. I never set him a 'Do nothing' action, and he still passes some turns. Even, I got him to heal himself when his HP was below 50% (even this action is the standard one), and he doesn't do it.... Other enemies I created before works perfectly, but not this... Any advice here? Thanks in advance.

does he have enough MP to do the heal?

Actually it didn't. I figured that just after posting this, but it seems it was a matter of movement rating. However, it might skip the healing movement and attack. Guess this solves my issue.

Thanks anyway.