Entity 333333

I wanted to explore the nether with my son for the first time. I was not scared because my son is a pro. When we got to the nether, I heard a screech. My son said that sound is not in the nether. we were both very scared and started looking for where the strange sound was coming from. we returned to our base. once we entered something jump scared us. we logged off immediately. The only thing we saw was its bloody eyes! we named it entity 333333.