Lightly, "I am off duty as well."

He knows what she's asking, but he honestly doesn't have an answer. Cassian is very good at trusting his instincts as well as being logical - so of course his instincts are telling him to be illogical.

"I don't want to be someone that helps Tarkin and his ilk."

Arresting Jyn would feed into their image of power, wouldn't it?