"Miracle Construct: This character can use Barrier. Once per use of Barrier, if a barrier terrain marker is placed adjacent to an opposing character, this character can make a close combat attack against that character as a free action as if they occupied the square by the barrier terrain."

My question is this - does a character with Probability Control need to see the square that the attacking Barrier is in to PC the roll?
Or does the character need to see the square that BardaMiracle actually occupies?

The square that the barrier is in. The attack is treated as if Barda is in that square