If there is one thing about contributing that is EASY TO DO IT IS

FINDING BUGS LIKE THIS EVEN SERVER OWNERS FIND THEM WITHOUT LOOKING AT
THE CODE. Then again perhaps, who's in charge of the QR for this
plugin??

NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightListener.java

@@ -223,8 +223,8 @@ public class FightListener extends CheckListener implements JoinLeaveListener{
                 // Could further guard by checking equality of loc to last location.
                 if (data.debug) {
                     debug(player, "(Assume sweep attack follow up damage.)");
-                    return cancelled;
                 }
+                return cancelled;
             }
         } else {
             // TODO: More side conditions for a sweep attack.