The tale tells of the Nether River Patriarch, who sought to slaughter all under Heaven, intercepted by the Ancestral Witch, with Wukong joining the battlefield and succeeding in his ambush, intent on killing the free and unrestrained Mara.
What the Mara said was indeed true, "Different paths do not conspire together." Everyone has their own path, and when two distinct paths converge, it becomes a narrow path where the brave prevails. Whoever is stronger will continue onwards.