‘It’s pulsating!’
Translation: It is flashing, sort of like a tail light on a plane.
The pulsating could just be the camera (cell phone?) just trying to auto refocus as well. Lots of possible explanations, over Mexico could be a shadow pilot running drugs, etc. The pilot’s juvenile behavior doesn’t help lend credibility to the witness, either. Pass.
Lol, I’ve got your pulsating orb right here!