en_tn_condensed/mrk/05/15.md

Legion

This was the name of the many demons that had been in the man. See how you translated this in Mark 5:9.

in his right mind

This is an idiom meaning that he is thinking clearly. Alternate translation: "of a normal mind" or "thinking clearly" (See: rc://en/ta/man/jit/figs-idiom)

they were afraid

The word "they" refers to the group of people who went out to see what had happened.