Comahue, of course, is the Mapuche name for northwest Patagonia. The authors note that this possible preadaptation for flapping renders it unlikely that avian flight evolved after a passive gliding stage. Although the long-legged predatory dinosaur could not fly, its forelimbs were extraordinarily winglike. They were jointed such that they would have been capable of flapping, should the dinosaur have found a need to, and likely were folded close to the animal's body like wings when not in use. The fossil was not found in sediment that would preserve feathers or other integument had they existed.
Quotes are from media sources.
Portions are from a public post to the Dinosaur Mailing List by Darren Naish.