At least when it was a normal Dusk, Tia did not treat Zheng Yichen as a drum that could destroy the world. After the Dusk turned abnormal, she fiercely beat against Zheng Yichen without stopping until the whole world was shattered.
When Tia dealt with Zheng Yichen, she focused on fragmenting and weakening Zheng Yichen's consciousness, not breaking his Time Gold Body.
Even without using oversized attacks, she aimed to shatter the time flow affecting Zheng Yichen's Time Gold Body if it could not be broken directly.
It's clear by comparison: the normal Dusk, no matter how much it hoped for the end of the Collective World, would not resort to such despicable acts as pulling the oxygen tubes, while the abnormal Dusk would.
So let's first let the Dusk return to normal.
"BOSS, please take care of yourself."
