The answer is that the subconscious mind will respond strongly with FEAR and RESISTANCE to the change. It will ask the conscious mind to examine the data again and again to see if the change is real, or whether it can be squeezed into the existing World View.
It will effectively ask: "ARE YOU REALLY SURE ABOUT THIS???"
If the change is a really big one then a mental breakdown could result, such is the strength of the subconscious resistance to changes in the main body of the picture!
For example: Supposing you walked into a room and saw a man suddenly rise up from the floor and hover, suspended in mid-air, six inches from the ceiling. This event would seriously undermine a major piece of your World View puzzle. (The piece which says that people cannot defy gravity without artificial means.)
Your first response would be SHOCK. Shock at such a basic piece of the jigsaw being violated. The conscious mind would attempt to change the World View of the subconscious mind by saying: "Look, a flying man!" The subconscious mind would respond with, "NO WAY!"
Such would be the reluctance of the subconscious mind to change the World View, that it would INSIST upon the conscious mind examining the facts very carefully again.
So you would dutifully examine every detail of the floating man. You would check carefully for ropes or wires, mirrors or other foul means of deception. Then you would pass this summarised data back to the subconscious mind; effectively saying, "Sorry, but it really is a floating man!"
The subconscious mind would STILL REFUSE TO ACCEPT THIS, and certainly would NOT start to alter the basic World View. It would suggest that the conscious mind look yet again! It must be a joke, surely? Or a trick; yes, someone was playing a trick! It wasn't a real man up there, probably a hydrogen-filled balloon in the shape of a man.
In short, the subconscious would try ANYTHING, no matter how wild, to convince itself that what was being experienced could be fitted into the EXISTING World View. It would FIGHT and SCREAM and KICK against making any alterations to that World View.
If, despite everything, the conscious mind could find no trickery, deception or illusion; would the subconscious then grudgingly accept that men could, under certain circumstances, float up to the ceiling? NO WAY! NOT A CHANCE! Instead, you would run out of the room screaming with terror! Anything rather than change such a basically-held belief.
Later on, you would go over the incident and think up some logical explanation for the event; something you had missed at the time, some reasonable method which would account for what you had seen. It was probably a publicity stunt; the man MUST have been supported somehow, after all, it was no different to those conjurors on the television, they were always doing things like that weren't they?
When your subconscious mind had seized upon an explanation, no matter how bizarre, it would breathe a BIG SIGH OF RELIEF at not having to change the World View! Everything would be back to normal, it could relax.