Loki holds up his hands, fingers spread wide as if to say see, I'm harmless. Not that any other iteration of himself is likely to be taken in by it. They all know better.

"Truth?" he offers with a grin, slowly lowering his hands. "A mishap with an experimental fusion of magic and mortal science. Which..." He steps closer, peering curiously at the other Loki. "Seems to have knocked me into another universe." The chains get a glance, and a disapproving tsk.