Avengers: Endgame - 33 Easter Eggs & References Explained
11. "On Your Left"
After Thanos and his army prepare to annihilate Cap, he receives a last-minute transmission from Falcon (Anthony Mackie), indicating that the dusted heroes have returned.
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Moments before they enter en masse through a series of Sanctum portals, though, Falcon tells his pal, "On your left", paying homage to the gag from The Winter Soldier, where Cap would routinely run laps around Sam during their morning workout.