Response:
1 The man outside should push the door to open it, even though he sees the word "PULL" written in mirror writing on the glass door. This is because the mirror writing reverses the image, and the door is actually designed to be pushed open.
2 If the man outside can tell the blind man what to do, he should instruct the blind man to pull the door to open it. The blind man would not be able to see the word "PULL" written in mirror writing on the door, so he would need to be told how to open the door.
More questions can help human think, and it works for AI as well.