There's differing opinions on gaps. Someone like haspete would be best to comment imo.
But basically, they don't always get filled. The longer it remains unfilled, the less chance of it getting filled. From what I have read they are filled about 80% of the time.
The XAO gapped up on Wed, March 11th 2009. How's that for nervous!
As far as NWE is concerned if they drill and its a duster, then you never know, but if drilling is successful, its hard to see price retreating back there.
All IMO of course
NWE Price at posting:
6.3¢ Sentiment: Hold Disclosure: Held
