They should have had a scene where the bad guy throws Dean (likely scenario) and Cas goes to catch him but halfway through Dean's arc through the air Cas remembers that a human man moving at speed towards an immovable object (angel) will hurt just as much as the wall he's trying to protect him from, so Dean hits Cas and he just folds like laundry, cradling Dean's body so tenderly even as they both hit the ground, and it works, the impact is swallowed in the soft heat of Cas's arms and Dean is so genuinely flustered that he just lays there on top of Cas even as the bad guy advances on them and Cas has to roll over Dean and shield him from a blow, and then he does get a little murderous because How Dare you think you can touch Dean Winchester? and he smites the fuck out of the bad guy and Dean is still laying on the ground just bright fucking red and wide eyed