I'm brand new to BBO (12 logins) and was playing in an Indy tournament with the auction 1♥ (p) 2♥ (p) ? to me. My hand was: ♠xxx ♥AJ9xx ♦KQ10x ♣A FWIW, I liked my hand and decided to explore game with 3♦, presuming no conventional game tries would apply in such a tournament. LHO (with a large number attached to his profile) asked for an explanation. I replied "no agreement". He persisted with "you must explain if asked". I was taken aback by this follow-up, but replied "natural", at which point he summoned the TD. After the hand LHO said that we self-alert here. My questions are: Did I need to alert 3♦? Was my "no agreement" response insufficient? Should I have even answered the follow-up? Was my LHO reasonable, including calling the TD? Thanks!