>>714141289Wiki says it's Magic/2 + 5, which would give 15. I haven't done FE6 in a while so I don't know if that's right.
I do know that baiting won't always work, however. If you have too much Resistance and the staff has a really low chance of hitting, the enemy won't try to Berserk you and waste shots.
In that same run later on in Ilia, there was a druid who just refused to fire at Clarine, even when I parked her well within his range and she was the only target. Anyone else, he'd Berserk right away, but not her.