Of course, Quinlan didn't forget to make his words vague. He neither used his nor Yinuo's name when making the promise!
He did this to ensure that no problems would pop up for him later on. However, little did he know that swearing to the heavens was the wrong choice if he wanted to muddle things up. After all, now that he swore, going back on his promise would call retribution lightning to strike him!
The Azure Dragon Spear thought that Quinlan knew this and was trying to be as sincere as possible, making her impression of him increase by several levels.
{Wonderful! From this moment on, I, the Azure Dragon Spear, pledge my unwavering loyalty to you as my True Master, until your soul fades from existence or I am shattered beyond mending. Together, we are bound by destiny!}
"...!"