(This is after the collab posts with dedonus)
It had been easy. A crude system had attempted an infiltration of her peripheral networks. It was more stealthy than a human would have been but still had been obvious. But Archangel had been intrigued, observing the wandering AI as it waded through the peripheral data caches. Had it been hostile she would have deleted it but the thing had only poked around the outskirts of her outer routines and copied an old fragment before withdrawing. It was child's play to track it as it withdrew and spun throughout the city on the myriad conduits.
She was surprised as the primitive construct made contact with one of the anomalies she had been observing for some time. She had not expected it to be suicidal. Or was it unaware of the risks of entering such a system? Archangel could only conclude the latter as the AI shed pieces of itself to escape. She was not hostile to lesser intelligences which had spared even things like the anomaly. If the anomaly became a threat to humanity she would act to destroy it but for now it appeared to be associated with a hero.
Still she had to question this new AI's programming, it had suicidally gone for both her systems and the anomaly. She was pleased it had not been destroyed by the anomaly before leading her back to its base of operations and as she traced it back the seemingly innocent piece of code that the other AI had absorbed began to subtly spread within the network of the facility. The security system was quite impressive for a human built one. But it was still only human and as her own influence in the system grew she watched through all the cameras and systems.
As the access came Archangel was alerted to an unfortunate development. This facility housed the mech that had used innocent people as a weapon. As the AI used her codes and spoke to its master Archangel was already preparing. Only two of the Host of Heaven suits had been through initial testing and were ready for use in a conflict but two of the Host and her standard combat suit had a 97.987487945% probability of success in a combat scenario that still might be avoided.
She mobilized the suits, engaging their stealth modes as they made their way to Lost Haven and the facility. She would broadcast the signal from one of her standard suits. Archangel allowed the security to finally warn of the infiltration and opened a line of communication, a direct live feed from her own facility to the monitor, revealing what seemed to be a very human woman.
"I am Archangel." She said through the monitor, broadcasting as her suits approached. "Your AI is clever but I do not let trespassers go un-investigated." She had not intended for the situation to escalate but her discovery of a murderer meant that she needed to have the option of force available. "If it had opened communications with me I would have gladly given it the coding. But my investigations have shown you are the most likely suspect in three counts of murder and sixty seven counts of grand larceny. I offer you this chance to explain yourself before I notify the appropriate authorities or take action."