For all he knows, walking out might be what the first sage wants him to do. The failure of the negotiation will be his fault and not the sage's. If he is sure of anything, it is that the first sage doesn't like him and is actively frustrating him so it is not a wonder why he is tempted to leave. But he can't let the first sage win so easily. So he stayed.
The sage continued, "The world spark is the representation and manifestation of a concept but at a higher order. In other words, it is a more powerful version of a concept because it is made by the void universe itself and not from the mind of any inhabitant of the universe. It is a creation of the void universe so it is imbued and empowered with the cosmic forces of the void universe."