This post is my total medical nerd talking, apologies. Just read this quote in "the man who mistook his wife for a hat" about hem-inattention (if somebody can't see to the left, for example):
"when the neglect is severe, the patient may behave almost as if one half of the universe had abruptly ceased to exist in any meaningful form... Patients with unilateral neglect behave not only as if nothing were actually happening in the left hemispace, but also as if nothing of any importance could be expected to occur there."
Reading this made me think of the snap. Would be interesting if half the universe in the soul stone had no recognition of the other half, if they come face to face.