The kukki-taekwondo poomsae Jitae ends in a series of double knifehand blocks
This seems like a sampling of the ending of Heian Shodan / Pinan Nidan. There you also perform a lunge punch and then turn into two double knifehand blocks. In the oldest versions of the Pinans, they are both low blocks.
They probably represent some kind of knockdown throw.
But in the Heian version, they were changed to middle blocks.
In Jitae, the first block is low, but the second block is middle. That's a little odd.
Applying the three-quarter turn into the low block is easy: we can just use it as a knockdown throw. But why end with a middle block afterwards? Seems anti-climatic if you use it as just a block or a frame.
The middle block can also be applied as a knockdown. See this double shuto uke application from Level Seven Martial Arts for example.
I'm not a huge fan of this application because without unbalancing the opponent first, the likelihood of it working is low. More likely you'll just push the opponent backwards. But someone suggested a "hidden" application to me: a sukui nage throw.
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The hands starting low but traveling to a middle block may be used to grasp and scoop up the opponent's legs. This changes the performance slightly, but it is (1) more effective than a simple pushdown and (2) you still move both palms together and end up in the middle double knifehand block position
