shadow mantle increased to 15 second duration

src/engine/powers/poweractions/ApplyEffectPowerAction.java

@@ -90,7 +90,7 @@ public class ApplyEffectPowerAction extends AbstractPowerAction {
         //		else
         duration = ab.getDuration(trains);
         if(ab.stackType.equals("BMHealing"))
-            duration = 10000;
+            duration = 15000;
         String stackType = ab.getStackType();
         if (stackType.equals("WeaponMove")) {
             DeferredPowerJob eff = new DeferredPowerJob(source, awo, stackType, trains, ab, pb, this.effect, this);