Monster AI Script

I've created an AI script where the boss as double the HP of its normal value. I've used the "Monsters #1, if hidden/dead, brought in with their HP restored, suddenly". This works, I kill it once and the in-battle text shows up and it gets "revived", I kill it again and it dies like a boss. Now here lies the problem, I gave it two "phases"; physical attacks only (1st phase) and magical attacks only (2nd phase), but in both "lives" it uses the first "phase" part only. Does anyone have any ideal on how to make it not use or completely ignore the 1st phase on its second life and instead use the 2nd "phase" part only.