For shooting, any shots that would normally hit the rider are split between Arahan and Naestra (ie, when riding a monster, the rider is normally hit on the roll of a 5+). For each hit that hits a rider, roll a further dice - on a 1-3 Arahan is struck, on a 4-6 Naestra is struck. Also, if their mount is slain, they will form into a skirmishing unit consisting of the two of them. If both sisters are slain, their mount will always react as if it had rolled a 5 or 6 on the Monster Reaction table.