It might have a condition where it needs to be on a previous target that was jailed in which case it can be used in conjunction with the jail. I don't think this is outing really because, if you think about it to its logical ends, it either means scun can use multiple abilities while town can't (which is similarly unlikely) or Flower made it more difficult for herself, with her claim out there for days, when she could just fake claim the cop shot rather than anything else. Her adding the jail on top of it just gives her more work to do.