They have a shared appreciation for weaponry. This is actually not an uncommon way for Sonja to get to know people, these days--she defines herself aggressively in her capacity and unnerving skill for killing. (She never spars. The idea of a fight in which death is not the object still strikes her nature as alien. Maybe she'll learn, eventually.)

"For everyone involved. Those sound interesting to make, too."

She wonders at the technique.