A healthy man becomes dumb for no reason?

4 seconds sound clip from the Yoga and the Kung Fu Girl (1979) movie soundboard.

You can hear this line at 00:44:52.858 in the DVD version of the movie.

Quote context

[...]

- If you can't seem to agree, why should anyone? Even I don't understand.

- I think we'll have Pa decide, see what he says.

- Madam Yu, you're to be honest. Has your husband really gone dumb because of this medicine?

- Here's the one, you see?

- Is this yours?

- That's right.

- Look at her! She's still selling the stuff! She should be punished!

- A healthy man becomes dumb for no reason?

- Shut up! Let's listen to Father first.

- Yes, let's listen to Mr. Ma.

- That's right, Master Ma. You have to see this!

- Madam Kao sells herbal medicine, that's a fact. And Mr. Yu's dumbness is also a fact. The question now, is Yu's dumbness related to Madam Kao's medicine?

- My husband was healthy before, he went dumb after he took the stuff.

[...]