Inter-Era Communication

"The Man Who Came Early."

The aitsjbom is a kind of Greek fire.

Gerald Robbins is renamed Gerald Samssom because his father is Sam.

Ospak is broadminded enough to have a Christian in his house despite local fear of witchcraft.

Christians lack the useful practice of human sacrifice. (It is useful to threaten thralls with it.)

Gerald makes a face at the home-brewed beer, perhaps his first social error. (When I still drank beer, I learned a useful social trick. I disliked the taste of my host's home-brew but it occurred to me that we taste only when we have swallowed so I knocked it back, thus flattering my host - "He likes my beer!" - who poured me more.)

Gerald speaks of Leif Eirikson before that chief has become well-known...

Ospak knows of Bjarni Herjulfsson who gave Manse Everard a polar bear rug. Of course, this has to be a different Bjarni Herjulfsson, or does it? Patrol scientists might discover that the time travel effect is sometimes generated between thunderstorms in different historical periods.