Forum:Medusa worm/golem sentry

During my opponent's turn, if my giant rat is destroyed as a result of battle and sent to the graveyard and I special summon a medusa worm or a golem sentry, can I flip it to face down defense position during my next turn, and then flip it back face up during the same turn. Also if I can, is it possible for me to do both of those changes in position during the same mainphase. Anush1 07:14, 12 July 2009 (UTC)