Well, he was...and while he was in the middle of sabotaging the rocket, he also went after Metis Cykes, Athena's mother. She was helping Prosecutor Blackquill track him down by making a psych profile from a small clip of the Phantom's voice. Obviously he saw her as a threat that needed to be removed. He didn't account for Athena being there though and he was stabbed in the hand. He spilled blood on a piece of moon rock sample and he tried to get rid of the evidence himself.

The "Hope" Capsule you had with you that came back a few days before your launch, it had the same moon rock sample inside it. That's why....that was why he came after you.