Yale didn't return to his house; he changed his appearance and left Sword City to be alone some time for thinking about the two options he had to obtain the Sword Bloodline.
Although Yale wasn't a saint, he wasn't a wicked person either, so he was hesitating about those methods.
The evil method was the one which would benefit him the fastest, but he was really reluctant to do it because of the fact that method was against his morals.
The method was quite simple and vicious; he needed to kill members of the Larken Clan with the Sword Bloodline and use Bloodline Manipulation to extract the bloodline and refine it to create his own, the better quality those members had, the quicker he would obtain it. In fact, by killing Lar and absorbing her bloodline, he would obtain the Sword Bloodline immediately.