Yu Yang and Yu Yue both have initiated the tribulation for the Core Formation realm simultaneously after Ling'er successfully survived her first strike of tribulation.
While Ling'er has to survive three strikes of tribulation both Yu Yang and Yu Yue has to survive the six strikes of tribulation.
After checking of Yu Yang and Yu Yue Jian returned to Ling'er and everyone there looked at him with a questioning look because they didn't know that Yu Yang and Yu Yue has initiated the tribulation.
They thought that the thunder clouds were gathering for something else so after returning Jian explained them everything ans when they find out that Yu Yang and Yu Yue both have initiated the tribulation they were shocked.
Especially Ye Qiao, because she has been in the sect for the start as Yu Yue and Yu Yang so she knew everything about them aside from there Cultivation Technique.