Forum:Light of intervention vs medusa worm

I just have a question about Light of intervention. If my opponent used Light of intervention, am I able to summon Medusa Worm(or golem sentry, any monster has once per turn flip face down effect) in attack position, and activate his effect to flip him face down?

Just wanted to make sure, because most of my deck uses flip effect...if I can't set card Ill be in pretty big trouble:(108.18.103.119 (talk) 22:12, February 7, 2013 (UTC)