It's as seamless as if they'd planned it in advance, as graceful as any dance could ever be. Bucky drops his own weapon and catches Steve's in one smooth motion, then rises to his feet and steadies his aim straight down the car as Steve charges in.

As Steve hits the top storage container and sends it flying straight for the HYDRA agent's head, their enemy ducks to the side -- and into Bucky's line of fire.

CRACK.

The HYDRA agent drops like a rock, and Bucky lowers Steve's gun and walks forward to join his friend.

"I had him on the ropes."