Avengers Infinity War post-credit scene gets a full breakdown and analysis! How does the end credits scene after Infinity War set up Avengers 4?

SPOILERS BELOW!

Avengers Infinity War ended on a shocking downbeat, leaving fans stunned through the credits until an interesting POST CREDIT SCENE. Erik Voss explains what happens in this scene and what it means for the Marvel Cinematic Universe. Who is Nick Fury trying to contact? What special cinematic device did the directors use in this scene, an