"Not your department?" Lambert looks at Sans incredulously, though he has just about enough common sense not to yell it, but hiss it softly between his teeth. He's not going to even address the actual question, that's how annoyed he is, as he's amply demonstrating with the wild gesticulation of one hand.

"I thought the whole point of having a guardian angel was to have someone looking after them."

Admittedly, if your guardian angel looked like Sans, maybe you were the type of person who didn't have long to live on this earth anyway. Sans looks less like a guard and more like a carrion bird waiting to descend.