Serge and Musyusik in the yard

Our two cats are eating something in the yard. We never found out what it was. However, soon the cat Serge died under strange circumstances. Perhaps the cats ate something poisonous. Cats usually don't eat anything in the yard. If they don't catch a mouse or a large insect. But that time they didn't catch anything. It was something very small. It was like it came out of nowhere. The cats just walked up to the grass and immediately began to eat something. We didn't pay attention to it then. But now it is perceived differently. I'm worried about this video that I made by accident. But nothing can be changed.

This is a video of our cat Serge
Video: "Cat sharpening its claws"
https://rumble.com/v31ysfy-cat-sharpening-its-claws.html