A small thing from a long time ago

Tell me about an incident when I was a kid, when I remembered being in junior high school, when there was an old man in the courtyard who was in his sixties, and I was impressed with him because one day he caught a rat that was quite big, and the rat in the cage, and the rat in the cage, with a pair of red eyes, squeaked back and forth, and I was also curious to see that the old man first took a chopstick and stabbed the rat, and the rat jumped up and down and jumped up and down with his front paws, and stood up very viciously I think it's funny to take a chopstick next to it and stab it, and I don't remember what verbal communication I had with the old man, I just remember that later the old man used pliers to clip the mouse's paws and cut it with scissors, and the four paws and tail were cut off, and the rat cage was not big, only there was a small hole in the wire on one side, and the old man stuck the pliers from that small hole to clamp the mouse's paw, and then when he stabbed the mouse again, the rat was no longer beginning to look fierce, and he was trembling in the corner of the small cage, and he didn't know why I was watching the rats shivering with blood, and I had an indescribable feeling in my heart, and I left, and now I'm basically an old man, and I can't forget it for decades, and the old man's smiling face and the rat's trembling state have been lingering in my mind, and whenever I can't say it, I can't help but come to my mind