The Cartomancer Mages

The following capacity explanation was taken from page 33 of Cry Havoc 13.

Each Cartomancer mage can use this capacity once per round. The player designates a fighter located even partially within 20 cm or less from the Car­tomancer mage when a roll has just been done for this target. No line of sight is required. The roll is cancelled and re-rolled. The new result replaces the first and it cannot be re-rolled anymore. This capac­ity can be used on the Cartomancer mage himself.

If the opponent has a similar capacity and declares its use on the same roll, the roll is not re-rolled and all the fighters implicated are considered as having used their capacity.