Karl had finished the phone call way earlier, and had joined in the half way fun, when Mrs Yuro had started to try and humiliate Zeva. But he intentionally did not come up at that time, and had stood at the sidelines watching.
He wanted to see how it goes, knowing that his wife… was far more capable of handling finely.
Also, he knew that it would be a perfect opportunity to burst the bubble of misconception that people here had about his wife, just because of her humble nature of background. They would get a gist that the wife of Karl Yang wasn't a thing of trifle, or a person to mess with. She wasn't a kitten but a tigress.
