Final answer:
It seems that at the end of the story 'The Night Face Up', the protagonist is living simultaneously in two different realities.
Step-by-step explanation:
Based on the given passage, it seems that option 4) He is living simultaneously in two different realities is true of the protagonist at the end of the story 'The Night Face Up'. The protagonist experiences a sudden transition from one reality to another, indicating that he is living in both Aztec times and the present day. The passage describes the protagonist standing at the gate of his own home in the present day and seeing his wife, but then he is abruptly met with a blow and everything turns dark and silent. This suggests that the protagonist is simultaneously living in two different realities.