Andrew and the others continued their journey without caring what Castor and the others would do with the merchant called Spigas because, in the letter they sent with the falcon, they specified that they had complete freedom to do what they thought was right.
The reason why Andrew gave him complete freedom, is that, unlike before, he was no longer afraid of the problems that could arise. In the battle against the Vilotti family, they had shown their strength and it was not so easy to intimidate them.
On the other hand, Andrew thought that now that he has the support of the royal family and the Caltu family, eliminating a small wandering merchant like Spigas would not cause problems.
Lastly, Andrew had confidence in Castor. It should not be forgotten that Castor was the captain of the largest and most powerful gang in the city of Calci and although that is not very inspiring, it does suggest that, when it comes to dark matters like these, Castor is capable.
