brostance

The climactic action shot or scene in a movie or comic where the characters pose in a dramatic way to show that they are ready to fight and got each other's backs.

Most common with two characters (such as in buddy action-comedies), can also be seen with ensembles (such as in The Avengers).

At first they were getting their asses handed to them, but when they hit the brostance, you knew shit was about to get real.