You know what? He'll take it. Shock and awe are very nice, but peaceable acceptance is nothing to sneeze at, either.

"There is nothing to be forgiven. No one here knows everyone they meet at a glance. I am Loki. My twin is also Loki, from a different, parallel reality. We have been fortunate enough to find one another here, and even more fortunate in that we get along so well."

"And you, friend? What can I call you?"