Luke let out an amused snort at that.

"I was thinking along the lines of the source of it all, but I suppose it doesn't hurt to be specific."

The last part, though... he wasn't sure at what point Trilla was from. Definitely before he left Tatooine, but he wasn't sure how much before. Considering she seemed to both hold this Cal person in high regard and very much aware of her death... well, he could guess.

"Vader," he murmured softly, suddenly very aware of the extra weight of a certain thing hidden in his boot.