The cube of force states that
a barrier of invisible force springs into existence, forming a cube 15 feet on a side.
And the effect of the 5th face says:
Nothing can pass through the barrier. Walls, floors, and ceilings can pass through at your discretion.
How would this work if there was a Huge (or larger) living creature currently occupying the space that the wall acts? Would it cut the creature in two, freeze it in space as it can't move in any direction, or force it to be on one side of the wall?
So, for instance if there was a 26-foot-tall storm giant, and I stood next to it and activated this 5th face, what would happen to the giant?