Every season since, Simpson has received all episode scripts shortly into the production process.

When you read the scripts, you realize the importance of certain moments, Simpson tells EW.

You want a character to go out well.

Game of Thrones Storyboard

HBO; Will Simpson/HBO

Im getting myself invested in the characters.

Each death is more horrific than the last, building up to Hodors tragic finale.

I didnt want it to look like he could escape, Simpson says.

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Weve seen that kind of thing in horror movies, but it was so important at this point.

And yet thats always been his destiny.

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

Game of Thrones"The Door"Storyboard

Will Simpson/HBO

GOT6-Ep605-Sc5.49-P3-P-131

Will Simpson/HBO

GOT6-Ep605-Sc5.49-P3-P-132

Will Simpson/HBO