Did some research and didn't see any topics on this possible problem to be aware of.
When going into fights where Chainspell Stun is used it's a good idea to use a grip that doesn't have AE: Stun on it, or you could mess up the stuns and allow a gap where a deadly move can go off. Also good not to use on mobs where there is a stun order to prevent things like a Dynamis NIN's Mijin Galkin (sp?) from going off.
Think ahead, you'll lose your TP if you have to swap.
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