The best outcome, Zhou Tian hoped, would be for the heavenly tribulation to directly obliterate the Vermilion Bird. If by chance the Vermilion Bird managed to survive, Zhou Tian felt that he should take action and deal with it, even at the risk of endangering himself. Apart from the fact that Zhou Tian bore a grudge against the Vermilion Bird, more importantly, judging by the bird's actions, Zhou Tian knew that if he didn't deal with it, the bird would cause countless slaughter on their continent once it survived the heavenly tribulation.
If it had been before, Zhou Tian might not necessarily have risked his life for such a matter. However, he had already unified the Continent now. Although some NPCs still lingered in the world, they no longer constituted a threat to Zhou Tian. Thus, according to the current situation, if the Vermilion Bird were to run amuck on the continent, the losses would be greatest for Zhou Tian.