Though, reading it over, there's no direction. What makes a good story is conflict. When the guys roll up with massive resources and your two, mostly unprepared characters overrun them, it seems like a non-event.

A good story needs an honest conflict. A simple battle wouldn't mean much.
Now, if your guys confronted them, to interrogate their presence, I think you'd get a much more interesting event. Or you could keep it mostly the same, but there were effective survivors from the blast, and you lost a guy. Short stories must be profound to be effective.

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