Vocators do what they're told, when they're told. Sense of honour to the Empress and that is about it. Also you might match the regulars as I expect everyone too but I'm not going to set Ivona on anyone for a while. With Ivona this is a order where the leader is the most deadly and must be killed for the new leader to come into play. She's already had 2 attempts on her life by her lieutenants and the order is hundreds of years old. Think how deadly that makes the leadership of this group. They'll stick in pairs for most opponents, add up into larger groups if necessary or a Lieutenant or the Ivona would be sent. Also if you get captured you get to go to the Palace and enter "Re-education" as it says. Failing that they'll just chop off your hands to get your relic.