Two singers missed tonight’s Eesti Laul due to health concerns, but it was one artist’s on stage stunt that had the audience really talking. Tonight’s semi-final was full of outside the box staging ideas. Andrei Zevakin and Grete began their performance of “Mis nüüd saab” backstage. Through a bit of camera trickery, Stig Rästa simulated floating in zero gravity. And, most …