Correct, but explosions all behave the same.
Not this one. This one did not explode "into" space, like the explosions you are describing. It is space.
You could never point in the direction of the "origin" of the Big Bang. This direction simply does not exist in space. As such, nothing can be said to be moving with any proper motion to any "blast direction".
We can't point our telescopes to this point in space, because it does not exist. So, instead, to take a snapshot, we had to image the entire observable universe.