Serenity kept her arrow aimed at the man, in case he tried to run. When the two were close enough she spoke up.
"What did this man do? Why do you want to kill him?" she asked simply. It was against the code to ignore a plea for help, but those pursuing the man were Tylosians as well- they had to have a reason.

Spoiler: Ooc
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If they attack the man without explaining anything they get an arrow to the face.

If the man tries to run away without an explanation he gets an arrow to the face.