Rage can sometimes lead to a state of mind where the individual experiencing it believes, and often is capable of doing things that may normally seem physically impossible.A person in rage may also experience tunnel vision, muffled hearing, increased heart rate and hyperventilation. If we look at the above information we can infer that "rage vision" is vision in which a person believes he has the ability to do anything. This would make sense because as you read further the man with the "rage vision" is told to fly with the orphan boy to the farthest part of the backwoods and raise him up to justify his Redemption. ...' Which in my opinion flying would be a very difficult task without having "rage vision".

A range of something gives a reference to a band of values within some limits on a scale possible for that something. Range of vision would give a bunch of similar visions between some imaginable realities. In rough short words - he was tripping for a moment. > Rough, intensive, violent, perplexing

I have no idea. The entire passage is really weird...