When Bilaz heard this, suddenly his heart was filled with regret. However, he didn't regret attacking Haory and other but attacking them alone was what he regretted.
Before they moved to search for Max in separate directions, Bartan only told them to find him and not engage.
Moreover, after he was found out, he could have retreated since Haory clearly asked him to do so.
However, because he was too arrogant and when he didn't like the way she spoke to him, he tried to kill them in anger, which led him to this moment.
He hesitated a little whether he should tell him or not. But since he already wanted to die, he told him.
"I... was hired... to kill... you. That dog... that dog of Daltons... hired us. Ugh! Please kill... me now." He said in a weak voice.