"For you to talk about how it's OK to be vulnerable, you have to be vulnerable," Gunn told the "Superman" star

Edited together as part of a 60-minute making-of feature, the seven-minute video shows Gunn walking Corenswet through Superman’s big final confrontation with Nicholas Hoult’s Lex Luthor, and specifically the moment when the Man Of Steel reminds Luthor he’s just as human as the rest of us.

The DCU Superman's most important ending scene appears to have benefitted from Gunn and Corenswet initially coming at it from different perspectives.