So I got into a firefight on -4 with some swarmers. No problem, I'll just gun them down because I'm totally butch.
During the fight, a convenient corridor was blasted out. Awesome, I'll just hop in it and take them out 1 at a time. After all, positioning is key when fighting.
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Until a builder came a long and decided to fix things up mid firefight.
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Un-climactic, yet humorous, way to end a run.