Defeated!

It has to be mentioned that the blade wasn't destroyed by Venerable Mei's hand alone. It was the movement of the combined Mystic efficacy of Venerable Mei and Lei Wubei which had destroyed it.

This had happened because Venerable Mei had forced the blade towards her right before she had tapped it with her finger. And, Lei Wubei had used his strength to turn it to the opposite direction. Both individuals had used the entire extent of their strength at that time. This meant that opposing forces had tried to twist the blade in different directions. And, it was then that Venerable Mei accumulated her Mystic efficacy, and tapped the blade with her finger. Her timing had been very precise!

The forces of Venerable Mei and the Great Master had been exerted on the knife at the same time. What kind of a Divine Weapon would be able to resist such forces?

The answer to that was a straightforward 'none'! At least, such was the case with Lei Wubei's treasured blade…