Back in the game, Jiang Fei used the Abyss Door to enter the 10th floor of the Abyss. Instead of greeting the Nephilim King, he was there to ask for Sharaz's help.
If he wanted to bait Evil Laughter out in the open, he would have to draw him in by exposing himself. He would need to be exposed to danger or Evil Laughter would not be drawn it. The best way to do that was with Sharaz's help. Only a Celestial tier boss could really be a threat to Jiang Fei. He would ask Sharaz to engage him in a pretended fight in order to lure the motherf*cker out in the open.
No one would, or rather, could fulfill Jiang Fei's requirement as Jiang Fei himself was too strong. Since there were no other Celestial tier NPCs out there to ask for help, Sharaz was the only one he could turn to.