Loki was captured by Shield and Tony was the one who interrogate him but he stopped some sort of drip intentionally to allow Loki to escape but Loki stabbed him in the side. And then Steve came to rescue.
Later Tony and Loki developed a relationship and Aroma, in a spell by Odin came and wanna kill Tony using Loki's 'knife(?)' which nearly kill Tony but didn't becoz Loki already gave him the apple.
Tony even rescued Loki from Odin later on and they seemed to be working together to save Thor.
I am will be most grateful if any of one know the fix T^T