"What a massive amount of magic energy. But, when did that guy call for reinforcements? Did I fall into his trap? Damn, I should have just taken the risk and killed him back in Amaharpe." Haazan internalized.
In the end, Izroth was still a Captain of Amaharpe's General Support Unit; therefore, Haazan could not openly attack him so deep into Amaharpe territory.
Luckily, Izroth crossed the Amaharpe border into O'Tohelm. In addition, the two kingdoms did not have an alliance with each other and the people of O'Tohelm were known for being extremely protective of their sacred grounds. Therefore, even if he killed Izroth, it would not draw much suspicion.
Judging from Neksiazon's reaction, Haazan knew that it could not be his ally. After all, the creatures of the netherworld were not exactly known for their acting ability. And, he had been keeping a close eye on Izroth the whole time.