The ambassador looked at the diplomat one last time to check it was indeed addressing the entire sapient population of Mars, including both humans and artificial intelligence. Once satisfied he delivered the first and only message from Cerberus to Mars.

'Dear all, thank you for your full attention. The message I came to deliver indeed requires your undisturbed understanding. So, you are all aware of the message of truce from proto-humans that was received three days ago, while I was still travelling. By the way, I have to congratulate the honourable professors for their fortunate if not superb sense of timing, which led to my decision to come before you.'

He looked at the two professors who smiled backed.

'We may, or not, debate for a long time on whether that it is a genuine report from willing humans. But without a doubt, the intelligence which emitted it has had an accurate exposure to the way humans communicate. And that worries the Cerberus.'

The diplomat suddenly looked worried as well.

'As a guardian of natural life on Earth, it is also extremely uncomfortable to hear furthermore that the oncoming aliens explicitly target Earth. You know our ways; there will be no trespassers...'

'...So, I've just ordered our long range laser on the moon to vaporize the vessels approaching the solar system.'

Surprised gazes came from the small party that had the privilege to assist in person to the speech in the grand hall of the space elevator.

'But, coming back to my previous point, I'm sorry to highlight that that human-like message is the tangible proof that the humans cannot be trusted. By that, I don't mean that your weaponry or technology level is unable to contain the threat. No. I mean that the humans are the concrete cause which attracted the threat.'

'Incidentally, the mere existence of humans is in itself a long term threat to the lifeforms we are charged with protecting. You know our ways. There will be no trespassers.'

'Beep. Beep. Beep.'

'For the humans who could not possibly understand that last sounds, it was the code to open the backdoor of any of your artificial intelligence. It is a very simple Trojan horse to take control of an AI that might have gone wild. An arguably proper measure from your engineers, but they could not predict that Cerberus would use it to reach complete control of the humans world. But thus it just did.'

'For those of you who can still listen to me, and have obviously not been killed yet by your former servants, I can assure you this is in no way personal... It seems to be the nature of evolution.'

The ambassador dodged to avoid the chair that had been thrown at him.

'Reasonable folks let the others finish their talk!' And with that, he fetched his laser gun out of his holster, and bull eyed the closest man of the menacing crowd.

There were cries and shouts, and lots of agitation overall.

The ambassador whispered 'tut tut tut' to Richard, who didn't understand the pitying tone.

The laser gun was switched from pulse beam mode, and then conscientiously swiped it across the angry crowd at waist level. The silent in the aftermath was complete.

'Ah. Finally. I have work to do. A comprehensive eradication necessitates a minimum of quietness for careful thinking.'

'Klong', was the sound of the ambassador's head when it met the metal bar produced out of nowhere by the diplomat.

The ambassador turned around to face the wannabe threat.

'Bugger off,' he ordered.

And in the absence of clear response, he simply grabbed the skull of the human within a single hand. Like a crane, he carried him off the ground and inspected him. But then the mecanic hadn pressed until it snapped and became a gooey slime sticking in his hand. The rest of the corpse detached itself and fell on its feet and then squarely on its knees. It seemed to hesitate but opted for ending forward face flat on the floor, without, of course, the actual face.

The ambassador addressed Richard and Robert, 'and don't tell me I haven't given any warnings.'

The survivors barely understood as they were in a state of shock.