You only see it occasionally and its more a natural reaction that works really well;
The quick elbow up like an extended bridge to deflect one that comming over the top of the same arm you see it occasionally and instinctivley during a war.
And that other one too we talked about Chris where you have missed ,your arm is straight ,your arms extended and they come over the top of it ,so you leave it out there and just turn your center line to face their arm and it stops it dead.
Both those could have combinations and set footwork put onto them so that they are made to work for you even better: like walking through their blocked arm and covering the other free arm with a hook or rip up the inside as you head out the other way.(nice way out of a corner)