Use level 4 Mesmerize. Calm the mob to prevent reaggro. Use level 4 mesmerize again. If he regains HP at 5% a tick, he properly memblurred. If he is already at 100%, invis yourself and con the mob, if he is Indifferent he memblurred, if he is threateningly he didn't.
If it's a see invis mob it's a bit harder to check. Just wait until mez breaks and see what he does.
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