You're probably not showing enough. I sometimes get frustrated during a really intense, emotional scene when the author whizzes through. For instance, in 'Alanna' by Tamora Pierce, Alanna's first swordfight (after she has been practicing, drilling and struggling to improve her swordwork for months) last about half a page. We're told a barebones account of the moves and countermoves of Alanna and her opponent, and that's it. Tamora Pierce would never make a rookie mistake like that now. In a scene which is really intense and important we want more - more action, more description, more reaction. We want to know how it smells, tastes, feels, to be in that moment, and we certainly want more than half a page.
Don't just tell us what happens. Show it happening. Show how it feels. Show how the important characters react to it happening. Make it BIG. Milk it for all it's worth. An you'll suddenly find that a formally well written but not terribly exciting page of writing jumps to life in front of you - and doubles in length.