While a Soresu user stayed on the defensive, however, and only counterattacked when necessary or when an opening appeared in his opponent's defense, a Djem So practitioner was not nearly so passive. Immediately after defending against an opponent's strike, a Djem So stylist would follow with an attack of their own, bringing the force of the opponent's own blow against them and seeking to dominate the duel.It probably helps to read Gumby's classic primer on Jiu jitsu and Lightsabre combat from On the Mat.
Unfortunately, while the On the Mat guys are great, their website is terrible from an archiving perspective. Here's a cached version.