diff --git a/src/server/scripts/EasternKingdoms/GrimBatol/boss_general_umbriss.cpp b/src/server/scripts/EasternKingdoms/GrimBatol/boss_general_umbriss.cpp
index 2879741a4ac..5993523a77e 100644
--- a/src/server/scripts/EasternKingdoms/GrimBatol/boss_general_umbriss.cpp
+++ b/src/server/scripts/EasternKingdoms/GrimBatol/boss_general_umbriss.cpp
@@ -53,6 +53,7 @@ enum Events
     EVENT_BLITZ,
     EVENT_GROUND_SIEGE,
     EVENT_SUMMON_SKARDYN,
+    EVENT_MAKE_AGGRESSIVE,
 
     // Skardyn
     EVENT_ATTACK_PLAYER,
@@ -155,10 +156,13 @@ struct boss_general_umbriss : public BossAI
                 DoCast(summon, SPELL_BLITZ);
                 break;
             case NPC_GROUND_SIEGE_STALKER:
+                me->AttackStop();
+                me->SetReactState(REACT_PASSIVE);
                 me->StopMoving();
                 me->SetFacingToObject(summon);
                 DoCast(summon, SPELL_GROUND_SIEGE);
                 Talk(SAY_ANNOUNCE_GROUND_SIEGE);
+                events.ScheduleEvent(EVENT_MAKE_AGGRESSIVE, Seconds(4) + Milliseconds(500));
                 break;
             default:
                 break;
@@ -220,6 +224,9 @@ struct boss_general_umbriss : public BossAI
                     }
                     events.Repeat(Seconds(23));
                     break;
+                case EVENT_MAKE_AGGRESSIVE:
+                    me->SetReactState(REACT_AGGRESSIVE);
+                    break;
                 default:
                     break;
             }