Q83: in the ring of counterspells, greater, in magic item compendium, it says: once per day as an immediate action, you can attempt to counter a single spell cast by a spellcaster you can see within 100 feet. Like the ring's other ability, this one requires no preparation or knowledge on your part. (no spellcast check either)"
Does this mean that it works even when flat footed, or does the immediate action pre-requisite trump the vague text part?