Joe Russo not only directed the Marvel Studios movie with his brother Anthony, he has a cameo in Endgame himself as a grieving man, and his daughter Ava Russo played Lila Barton. Family clearly means a lot to him, and that's why one particular scene appears to have hit him harder than the others: The opening scene, where we catch up to where Clint Barton/Hawkeye (Jeremy Renner) was during The Decimation of Avengers: Infinity War. His entire family disappeared in front of him. Here's Joe Russo's take on that moment: