en_tn/mrk/16/12.md

he appeared in a different form

Jesus was the person whom the "two of them" saw, but what they saw did not look like Jesus, so they did not know they were looking at Jesus.

two of them

two of "those who were with him" (Mark 16:10)

they did not believe them

The rest of the disciples did not believe what the two who had been walking in the country said.