Blood Nether died at Zhouyang's hand, this is a fact.
But the truth is, the Yellow Sand Sect will certainly not publicly announce it like that.
Thus, on the way back to the Yellow Sand Sect with Zhouyang, after a round of friendly (forced) discussion (exchange) with Cao Wenjin, it was decided that the credit for this feat would entirely be attributed to Cao Wenjin himself.
As for Cyan Yang Daoist, he just wanted to kill Blood Nether to avenge his beloved disciple, to perfect his Dao Heart, and didn't care much about such empty fame.
Moreover, they were able to catch up with Blood Nether this time, preventing him from using the "Blood Escape Technique" to flee, thanks to Jiang Ming sacrificing his own life to perform the "Soul-Linking Charm" secret technique. In terms of emotions and reason, this credit couldn't exclude the Yellow Sand Sect's share.
