It's when he crosses the joint in the center that it all comes apart.

Steel shrieks as the beam ratchets downward and begins to tear free of its anchor on the far side. He abandons caution and breaks into a mad dash, then leaps for the far railing as the whole thing gives way beneath his feet.

Bucky pulls himself up and rolls over the top of the rail to the dubious safety of the catwalk, then stares back across the abyss at Steve.

"There's got to be a rope or something!" he shouts.