The knives, was where it really hurts. In the manifest, it specified two.

He's not bothering anybody. Get out of here before they arrive." We continued to rock the station. They're angry... Greedy... THEY'RE MANTIS PIRATES!" "So. They're like Mantis pirates?" "No. They aren't just LIKE Mantis pirates, they're a rescue team that rides the magnetic field of the Slug ships, and any ships.