Forum:Medusa worm

hi everyone!!!! i just wanted to ask the effect of Medusa Worm.... its effect says "when this card is flip summoned"... does it mean that its effect will be activated when the controller flips it during his own turn? does its effect will be activated when the opponent activated [[Swords Of Revealing Light]? and lastly, does its effect will be activated when the opponent attacks it while its in face down defense position?? P.S. sorry for my wrong grammar... hihi!