If you witness someone in your city get ganked you cannot tab target them unless you are flagged. The only possible way to target them without flagging and using tab is manually clicking them or typing %t name. This makes it EXTREMELY difficult to target smaller players especially if they are sprinting. Why has not been fixed for 15 + years?
Why not just flag yourself? If you’re going to engage in PvP such that you need to target them, flag like you’re meant to.