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I think that the idea of this is cool, but a few things:
1. What type of movie is this going to be? It sounds like a military war/action movie, but not being able to see the enemy would hinder the action considerably. So is it going to be more suspense?
2. The idea of not seeing the enemy is very, very cool, but like others are saying I think it would be tough to fill up an hour and a half with no enemy shown, b/c how would you show the conflict?
3. Since they are coming from Canada I think you should have Terrence and Philip be the enemy. Just show that the enemy is burning people and at the end reveal that it is just these 2 farting out flames at people!
BTW - I was just joking about that 3rd thing. It would be funny though.
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