Confusion, bewilderment, doubt.
It wasn't doubt about the fantastical Demon Arts from her junior brother's mouth, no, the strange things Jiang Feng spoke of went beyond what Demon Arts could describe; they could only be labeled as an evil technique.
She was doubting herself, trapped in self-doubt.
This was the first time Liu Tangxi doubted whether she was too slow, because her junior brother's descriptions were detailed enough and he tried his best to explain them using terms from the Cultivation World, yet she still felt utterly lost.
It was apparent at a glance that he wasn't making it up.
His heartbeat was steady, his pulse showed no irregularities, his expression was unchanged, and there was even a hint of understanding in his eyes. Clearly, Jiang Feng hadn't expected her to understand.
Such was indeed the case.