In fact, Shen Tian kind of expected Yu Pianxian's invitation.
He had already seen this scene in Qi Shaoxuan's halo.
If he did not interfere with the battle just now, Qi Shaoxuan would fight to the death with Bi Xuanqing and Er Tongtian.
In the end, both parties would suffer greatly, and Qi Shaoxuan would be badly wounded.
Then, the Mermaid Princess, Yu Pianxian, would invite Qi Shaoxuan to her place because she found him to be very, very powerful.
However, Shen Tian did not think it was worthwhile for him to be badly wounded just to meet the Mermaid Princess.
As such, he decided to take Qi Shaoxuan's place and fight with Er Tongtian instead to prevent Qi Shaoxuan from getting hurt.
This is all because of my kindness! I don't have to tell that to everyone!
I've just done him a favor!
As for what happened just now, Shen Tian had more or less planned it.