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Message: <blockquote data-quote="Gaiden" data-source="post: 3946015" data-attributes="member: 103">I don't think this is RAW, but there is a common sense approach with how to handle this feat:  there is no reason a caster would know that he can or cannot cast defensively (not unless he has gone up against a mageslayer in the past and then you demonstrate with your ability or he has foreknowledge that you have a similar ability).  Thus, a caster would generally act as he would normally, i.e. cast defensively.  If he successfully casts defensively, the mageslayer still would get an AoO.  If he botches the spell trying to cast defensively, then he botches the spell.After going up against this feat several times, the mage should realize there is no point in casting defensively as he is only hampering himself in possibly botching the spell.  He either should move away or just eat the AoO and hope to beat the concentration check if he casts in place.Just reinterpret the text of Mageslayer to read as:  when a caster attempts to cast defensively, even if successful with his concentration check, you still get an AoO against him.There, problem solved.</blockquote>