NARRATOR: One hasty research session later...
KATHRYN: I've found answers for you, sir.
KATHRYN: The fabric is laced with molecular-lattice "stiffeners," and there's a variable albedo layer, along with a bunch of other systems whose physics I can't follow, much less explain.
Now, before you say "That still doesn't answer my question," I have the answer to your real question.
KATHRYN: Here is a list of the ways the star-sail can be used as a weapon.
CDRE TAGON: "Star light, star bright, last thing you see tonight..."