I do not see total defense and full round casting as quivelant types of action. In one case, you are focusing specifically on combat, in the other you are ignoring it.
I can't find the FAQ reference Hyp eluded to earlier, so that doesn't help.
The way I see it, total defense is only a standard action and does not infinge on any other actions you might take in a round. Casting a spell with a full round casting time specifically states that it does interfer with other actions (you can be disrupted).
I don't think the total defense option prevents a person from taking free actions. Likewise, I don't think it prevents AoOs.
I can't find the FAQ reference Hyp eluded to earlier, so that doesn't help.
The way I see it, total defense is only a standard action and does not infinge on any other actions you might take in a round. Casting a spell with a full round casting time specifically states that it does interfer with other actions (you can be disrupted).
I don't think the total defense option prevents a person from taking free actions. Likewise, I don't think it prevents AoOs.