A centipede dies but never falls.
This saying refers to the tenacity of an insect's life force; even when cut into pieces, it doesn't die immediately.
Gao Xuan, to preserve the integrity of the Thought Sensing Body, only stopped after slashing through Starlight's body.
According to the records in the Book of All-Knowing, the Mechanical Battle Cicada will absorb the Thought Sensing Body, converting it into its own War Spirit. This is how the Mechanical Battle Cicada can be activated.
What Gao Xuan found surprising was that the Thought Sensing Body absorbed by the Mechanical Battle Cicada still retained part of its consciousness. This was very problematic.
Starlight had its own independent consciousness. If his consciousness occupied the Mechanical Battle Cicada, then it would become a marvel of Starlight, having nothing to do with Gao Xuan anymore.
Such a change was not recorded in the Book of All-Knowing.