About this video

So I downloaded some form of the dance together mod, none of the text in the mcm worked but I got it working nonetheless.
while messing around with it something happened that honestly scared me shitless but in a fun way. If you skip to 0:44 an NPC appears and does something fucking amazing, I didn't tell him to do it and I wouldn't know how to if I tried, kudos to the mod author for making it happen automatically.