His suspicion of the true motive of the god of knowledge is why he ultimately chose not to give his summons the location of their true body in the real world and make them kill the god of knowledge there, even though it will be easy to do so.
He doesn't want to kill the god of knowledge's true body because the death of the god of death will quicken the fusion of their minds.
He also doesn't want to kill the god of knowledge in this virtual mental world. He doesn't even want to fight at all.
What he wants is to take a break from the fight and use the time to think and find a solution out of this conundrum. Unfortunately for him, he can't stop trying to kill the god of knowledge here because the god of knowledge will try to kill him if he holds back.
He may not be motivated to kill, but the God of knowledge is highly motivated about killing him. After all, according to what the god of knowledge said, whoever wins the fight will become the dominant personality.
