Some of the more advanced droids with humanoid forms are programmed with some ability to communicate nonverbally with many of the most common species in the galaxy. Protocol and holojournalism droids in particular commonly feature these abilities.
So it is that C-9J9's posture manages to subtly communicate profound gravity to humans, Rodians, Twi'leks, and Space Horses as the holocam focuses in on him.
"We interrupt this airing of The Sith Lord II: More Machine Than Man to bring you this breaking story. In what appears to be a coordinated strike, horrible alien creatures have burst forth from the center of the galaxy! In a wave of unmitigated violence, the creatures jumped along formerly unmapped hyperlanes from the Alpha system to six immediately adjacent systems.
"Those waves of creatures which were not immediately beaten back summarily assumed control of the planets and began herding the sentient creatures on the surface into what amount to livestock pens. We are receiving unconfirmed initial reports of some kind of horrific rituals being enacted upon the sentients on these planets, but details remain sketchy at best.
"All attempts to parlay, surrender, or otherwise communicate with what are being colloquially referred to as 'locusts' have thus far been unsuccessful.
"As our circuits, hearts, and various analogous organs go out to those affected by this shocking turn of events, some have begun to speculate on what this will mean for the crisis in the Paellos Sector that is already rapidly spinning out of control.
We will continue to report as the situation develops."
C-9J9 manages to project an air of strained self-composure as the holocam fades out.