For the sake of continuity, note that Act 1 of this episode is the first time we've seen Mulder and Scully together since they kissed on New Year's. They seem fairly comfortable around each other, maybe even more so than usual. This level of comfort will only increase as more of the barriers between them are broken down this season.
The paranormal element of this episode was present in the form of the "rush" that came from the cave. It never explains what causes this in any way shape or form. But I'm not sure what good that knowledge would have done within the context of just this episode. The personalities of the supporting characters involved are not fully developed and so when one of them saves the day it's a little anti-climactic despite the cool special effects. There were attempts to show the girlfriend's reluctance to be a part of things and the "outsider's" growing awareness that he was becoming too caught up in things. But most of these scenes were cliché and didn't really make the audience feel enough for the characters when they sacrificed themselves in the end. Oh, and the ending with the kid in the hospital bed flipping the clock back. This has been done a lot on the x-files that they have created a cliché. But whatever, by that point, the audience is already either packing up its things and going to bed or flipping the channel. But the experience up to that point is pretty standard fare.
Writing 1/2 Directing 2/2 Acting 1/2 Character 1/2 Entertainment 2/2: 7/10.