BTW, what exactly is "He Cho Mahkee"?
Everyone elses reply pretty much sums up what I would have said. However, I would like to add that this is one of my pet peeves when it comes to Tang Soo Do. It's not the art, in particular, its the terminology. When I talk to other tangsoodoin, often I find that knowing what I'm talking about is hit or miss, when I use Korean terminology. There is no standardization and the pronounciation of the Korean has gotten so bad that mistakes have become generational. Tang Soo is in essence, tongue tied.
On top of this, "what exactly is he cho mahkee," that's a good question. I learned it as a basic technique at red belt in which we would march up and down the floor spreading our hands so that both arms would spread laterally from our bodies ending extended with both appendages bent perpendicular angles. What is that supposed to do?
This is why I feel so strongly that picking random moves from a form and practicing them as basics is really missing the point. I beleive these moves aren't meant to be dissected like that. It leads to an incorrect analysis that leads to a lot of misconceptions. The whole term, "spread block" doesn't really make any sense. What are you spreading? What are you blocking?
The answer is that its not "spreading" or "blocking" anything. It "could" be a lot of things, however. One of them, IMO, is kata guruma.