Phaetos roaring in fustration as his prey slipped away to live another day, either that or yawning really aggressively or about to sneeze or something i dunno, you be the judge

No that is not some kind of beam cannon but is how he "eats" parts from prey, Macherion carbide plated detherion teeth (One of the hardest materials within his manufacturing galaxy) revolving counter-rotationally to each row which effectively break the parts down, and high speed counter rotational razor plates right at the back of his mouth, the whole assembly is induction heated to moltify the materials and he can vary the temperature depending on what he's eating.