en_tn/luk/04/31.md

he went down

"Jesus went downhill." Capernaum was lower in altitude than Nazareth.

Capernaum, a city in Galilee

Since Jesus was already in Galilee, this could be translated as "Capernaum, another city in Galilee."

astonished

"greatly surprised" or "impressed"

he spoke with authority

This could be translated as "his word had authority" or "he spoke as one with authority."