A seasoned marine like Helen felt something was wrong with Roman's choice, while Roman needed to do something to camouflage the stolen nightmare stone.
Combining these two facts together, Angor slowly reached a possible and terrible idea.
"Sir, you mentioned 'another possibility' just now?" Helen asked.
Angor decided to give her the answer, which shocked Helen into a complete daze.
"As I said," Angor continued, "he would like to pretend that the nightmare stone on The Limpet disappeared due to something he had no control over, so Floating Mech City won't blame him. The easiest way to do this…"
Is to eliminate this ship.
He didn't say the final conclusion, but Helen was smart enough to tell.