The door finally swings open and at the same time he could hear the door in the real world open. Going through it will make all the terror and fear of whatever is outside just...stop. It's not there. It never was.

The door leading to the copy of Hiroshi's bedroom is already open for him in the Nexus. It seems even his part of the dream world recognized the danger he thought he was in.

Now, if he goes through that door, he'll simply wake up to an empty library in the real world. However there is suddenly a presence behind him the minute he approaches the door and if he turns to look it will cause him horrible pain. His mind will not be able to process whatever it is but the pain will wake him up too, even if he falls out of his chair as a result.