They are capable of blocking attacks aimed at their front (even a sword with Pierce), but they are vulnerable from the sides and back, and cannot block Bombs from the front. They will ignore the player and walk around slowly if the player is far away, but will walk towards nearby players, then getting out their miniature sword and attempting to ram the player. If bounced off of a shield while ramming they will stop moving for a short time before continuing the ramming process (straight line), and they stand still for a few seconds after they stop ramming, allowing the player to attack them from behind. For some reason they will ignore the player if they stop with a one square obstacle between them and the player, and they will turn around, allowing the player to hit them if they have a pierce weapon. They only notice the player if the player is in front of them or hits them. They are pretty hard to get in the Bestiary, but the Bestiary has Pierce, which makes it easier.