In mid-stage, an earth-level iron-back armor blood beast appears. It's a tough beast to kill, but it's also a good one to have around. Prince Heng-cao tells all of the warriors to kill all the martial artists who entered the blood-spirit pool. You'll get a rank three treasure for killing all of them. This is a good thing, because it means that you're not only on the level of the warrior, but also on the realm of the beast. In other words, you can kill a warrior on the ground, but you can't just kill him on the air level. That's why he's the one who killed the first warrior. He's now on the same level as the second warrior, and he wants to kill the third warrior as well. He tells the other warriors to continue hunting for blood-beasts, because all the warriors from the qi country have to die.