Tang Shaoyang thought the battle would be over the moment Avyn joined the fight. He was wrong; the battle was getting more intense. Han Taiyang was holding against the onslaught from the women.
He quickly noticed the smile on the two women's faces. They were enjoying this, and he recalled what they said before the fight. This was their trick to tame the spirit cultivator, toning down the arrogance a little bit before joining them in the ranks.
"If he survives this long, he should be at least at the high rank Archaic Spirit or even maybe the pinnacle rank Archaic Spirit."
Avyn and Zara might not go all out with all their big skills, but the fact that Han Taiyang was still on his feet, fighting back even, was a show that he was at least a high-rank Archaic Spirit. That changed his mind to sacrifice Han Taiyang, as it was rare and took a lot to summon a high-rank Archaic Spirit. It would be a waste to sacrifice such a high-ranked spirit.