Well, we found them, and the result wasn't pretty. Two teams killed before they realized what was going on, third team managed to call for air support before Nightcrawler and Basroil Squad picked them off.
Then Nightcrawler and his damned goons shot down the gunship.
We've already run information-suppression, clean-up, and damage-control. Situation will look like it never happened.
I need to re-think my strategy, here. Nightcrawler's not as inept as his after-action reports from fighting this Slender Man thing had led me to believe.