It was a snippet from Winter Soldier that expanded a bit on a scene from the trailer. Fury is being pursued down the streets by two cars of Bad Guys, while dodging automatic weapons fire and screaming into his cell phone “Get me off the grid!” Then the Winter Soldier steps up, zaps Fury’s SUV, and then walks towards it as Fury lies trapped inside.
Triplett could well be a mole, although I’m tending towards Sidwell myself.