The older woman was still asking the two men at her door. She didn't recognize the two men, and she felt something strange when they both looked at her.
"Did you see a foreign man?" A man asked the older woman.
"Foreign man? I didn't see the foreign man you asked about," The old woman replied confidently.
The two men stared at each other, the two of them indirectly communicating with each other. They finally decided to go to find Sergei's whereabouts.
They didn't smell the vampire scent from Sergei's body at all. So they don't realize that Sergei is currently sleeping in one of the older woman's rooms.
After the two men left, the older woman walked back and entered her house. She felt sure that the two men who had been looking for the man were in one of her rooms.
However, the older woman didn't tell her because she felt she had to protect her. And the older woman is still under Sergei's influence.