When his sister fell asleep, Owen stayed awake, considering how he should respond next.
At the village entrance in the dusky evening, he had originally intended to admit that the seven people led by Marlowe were killed by him. Surprisingly, those seven nobodies were apparently figures of significance in the outside world. Hence, he had to adjust his plan at the last moment.
In recent times, Owen had intentionally been displaying his "remarkable" abilities to the Horizon Bureau, laying the groundwork for the day he would have to leave the village with his sister.
That was why he took the initiative to save Abigail, and in her presence, easily subdued the Repair Ghost.
But when it came to Marlowe, he had to proceed with caution.
Defeating the Repair Ghost could be interpreted as his Chain Lock Magical Instrument being a perfect counter to the ghost.
But the situation was different with Marlowe's party.