To get this out of the way, I know Herobrine is not really in the game now. But that does not mean he won't be added. My proof is in disc 11. That sound file was in the game for a long time, long before Endermen. But Herobrine existed in that time. My evidence is listen to the end right after the guy runs out of the cave. It sounds like something barks HEROBRI-.
I kind of though two diffrent ways the thing went on the disc
One) was that a evil persons(I.E the villagers..... maybe....) started summoning Herobrine(remeber the way to summon him? 9 gold block, 1 netherack and a flint & tinder in mutiplayer) the pages flipping, he did it underground because many helicopters where flying around trying to catch him(I.E the helicopter sounds) he started summing him but looked in the book and saw that he made a terrible mistake, he quickly ran out (the sounds of stone being hit) and then running on grass, he quickly saw a helicopter and a group of people and quickly yelled "HEROBRINE!" but was cut off
my second theroy is that a minner was minning for iron,gold,dimond coal and other neccecitys that he and his village neede(the sound of diggy diggy holeing) he started digging but fell into a cavern, he quickly started to try can create a light source(The lighter sounds) and started hearing sounds, scared he flip through the book and try to figure out the sounds and the sounds match..... herobrine..... he quickly started digging upwords (the sound of rapid digging and mineing) he made it to land before being killed by herobrine
One) was that a evil persons(I.E the villagers..... maybe....) started summoning Herobrine(remeber the way to summon him? 9 gold block, 1 netherack and a flint & tinder in mutiplayer) the pages flipping, he did it underground because many helicopters where flying around trying to catch him(I.E the helicopter sounds) he started summing him but looked in the book and saw that he made a terrible mistake, he quickly ran out (the sounds of stone being hit) and then running on grass, he quickly saw a helicopter and a group of people and quickly yelled "HEROBRINE!" but was cut off
my second theroy is that a minner was minning for iron,gold,dimond coal and other neccecitys that he and his village neede(the sound of diggy diggy holeing) he started digging but fell into a cavern, he quickly started to try can create a light source(The lighter sounds) and started hearing sounds, scared he flip through the book and try to figure out the sounds and the sounds match..... herobrine..... he quickly started digging upwords (the sound of rapid digging and mineing) he made it to land before being killed by herobrine
hope you have fun dreaming tonight >:3