Make some cleanup.

My thank goes to Az@zel for the code analysis.

--HG--
branch : trunk

src/server/scripts/EasternKingdoms/Karazhan/boss_terestian_illhoof.cpp

@@ -184,7 +184,7 @@ public:
 
         void Reset()
         {
-            summons.DespawnAll();
+            DespawnAllImp();
         }
 
         void JustSummoned(Creature* summon)

src/server/scripts/EasternKingdoms/MagistersTerrace/boss_selin_fireheart.cpp

@@ -125,8 +125,10 @@ public:
             DrainLifeTimer = 3000 + rand()%4000;
             DrainManaTimer = DrainLifeTimer + 5000;
             FelExplosionTimer = 2100;
-            DrainCrystalTimer = 10000 + rand()%5000;
-            DrainCrystalTimer = 20000 + rand()%5000;
+            if (IsHeroic())
+                DrainCrystalTimer = 10000 + rand()%5000;
+            else
+                DrainCrystalTimer = 20000 + rand()%5000;
             EmpowerTimer = 10000;
 
             IsDraining = false;