To be honest, Xu Jin really hoped they would leave their main force behind and come after him alone; that would have made Xu Jin's day.
Without a doubt, Xu Jin had created a time difference.
Even if reinforcements had arrived shortly after Xu Jin left the Fire Oak Tribe, the time difference Xu Jin had created was at least two hours.
The journey of two hundred li, for the main force of the Star Refining Realm, would take at least two hours.
In fact, when Xu Jin arrived in the vicinity of the Fire Separation Tribe and found a deserted place to start recovering his Star Power, Chi Dian had just led the assembled elites from four other tribes to the Fire Oak Tribe that Xu Jin had massacred.
Of course, Xu Jin had only slain the elites of the Star Refining Realm.
As for those in the Star Casting Realm, Xu Jin didn't have the time or energy.
Slaughtering them would be a pure waste of Star Power given Xu Jin's current time constraints.