It looked like he was underestimating this hundred player dungeon. No one was happy. Pulling four statues at once should have meant that he thought very highly of the team, but they still weren't happy. That's why being a tank was difficult.
The four statues were the same class, Blade Masters. They were a bit different from playable blademasters though. They used stone swords, not light sabers, and didn't posses sword aura. They attacked with plain and simple swordplay. Compared to playable Blade Masters, their attacks had lower range. Playable Blade Masters had a variety of skills, such as Sword Draw or attacked by using their sword aura, allowing them to attack farther than their weapon's physical capabilities. However, these four stone statues didn't have these types of methods.