Failure was the mother of success. Just because Ves accidentally exploded Peter Seterin's mind did not mean he intended to fail again this time!
The stakes were higher this time. Ves did not care a thing about the life of a former slave turned bad.
Ketis was different! Ves genuinely cared about her life and wellbeing.
So far, Ves learned many lessons from his human experimentations. Many of his captives suffered horribly from his callous spiritual manipulation.
Due to his penchant for limit testing, Ves often tended to pursue extremes, much to the detriment of his unfortunate test subjects.
He did not feel guilty for harming them, distorting them or killing them. To Ves, they were irredeemable pirates who deserved to die. At least this way they at least contributed back to society before they inevitably succumbed.
His test subjects did not suffer in vain.