Cynthia Erivo performed some real magic on Thursday when she saved Wicked co-star Ariana Grande from an overeager “troll” at the premiere of the blockbuster’s second chapter in Singapore.The Oscar nominees were walking down a yellow brick road-inspired carpet, holding hands with co-star Michelle Yeoh and posing for fans, when a man screamed and hopped the barricade, according to fan footage. The man then wrapped an arm around 32-year-old Grande, only for Erivo, 38, and a guard to cut in.Erivo...