Forum:KB:Lightsaber+Stormtroopers=?

In Battlefront II when a lightsaber connects with a stormtrooper, clone, or other organic, you see sparks but no apparent lightsaber mark (well, as far as PSP graphics go...). I've also seen The Force Unleashed trailers, and there's still no lightsaber mark on impact. Does it have to do with armor integrity, or was it just to graphic to put in the game? (cause we all saw what Yoda's lightsaber did to that clone in ROTS) PLZ help me with this!!!