To my way of thinking the situation is as follows: it’s an individual event so, unless the opponents happen by coincidence to be regular partners, there is no partnership agreement so nothing to disclose. Actually, even if they were a regular partnership I’d be very surprised if they had an agreement that covered this situation, other than general principles (e.g. “over a strong 1C we bid immediately on weak hands but pass and come in later on strong hands”). As to what the bid does mean, my guess would be a strong two suiter. With a weak two suiter you would bid immediately over 2C (probably), with a three suiter you would double 2S and with a single suiter you’d just bid the suit.