diff --git a/server/gameserver/creature.cc b/server/gameserver/creature.cc
index fc744a0..7fa25e0 100644
--- a/server/gameserver/creature.cc
+++ b/server/gameserver/creature.cc
@@ -884,8 +884,13 @@ void Creature::ProcBuffEffect(Creature* caster, Buff* buff)
     case kBET_FlashMove:
         {
             a8::Vec2 old_pos = GetPos();
-            a8::Vec2 new_pos = GetPos() + skill_dir_ * skill_distance_;
+            a8::Vec2 new_pos = GetPos() + skill_dir_ * std::max(skill_distance_, 300.0f);
             SetPos(new_pos);
+            if (CollisonDetection()) {
+                SetPos(old_pos);
+            } else {
+                room->grid_service->MoveCreature(this);
+            }
         }
         break;
     default:
@@ -1347,7 +1352,6 @@ RoomObstacle* Creature::SummonObstacle(int id, const a8::Vec2& pos)
 
 bool Creature::CollisonDetection()
 {
-    #if 0
     if (room->OverBorder(GetPos(), GetRadius())){
         return true;
     }
@@ -1367,10 +1371,8 @@ bool Creature::CollisonDetection()
             {
                 Obstacle* obstacle = (Obstacle*)collider->owner;
                 if (!obstacle->IsDead(room) &&
-                    (
-                     (collider->type == CT_Aabb && aabb_box.Intersect((ColliderComponent*)collider)) ||
-                     (collider->type == CT_Circle && self_collider_->Intersect((ColliderComponent*)collider))
-                     )) {
+                    (collider->type == CT_Aabb && aabb_box.Intersect((ColliderComponent*)collider))
+                    ) {
                     return true;
                 }
             }
@@ -1378,10 +1380,7 @@ bool Creature::CollisonDetection()
         case ET_Building:
             {
                 if (
-                    (
-                     (collider->type == CT_Aabb && aabb_box.Intersect((ColliderComponent*)collider)) ||
-                     (collider->type == CT_Circle && self_collider_->Intersect((ColliderComponent*)collider))
-                     )
+                     (collider->type == CT_Aabb && aabb_box.Intersect((ColliderComponent*)collider))
                     ) {
                     return true;
                 }
@@ -1391,6 +1390,5 @@ bool Creature::CollisonDetection()
             break;
         }
     }
-    #endif
     return false;
 }
diff --git a/server/gameserver/hero.cc b/server/gameserver/hero.cc
index e246307..774bcf1 100644
--- a/server/gameserver/hero.cc
+++ b/server/gameserver/hero.cc
@@ -56,19 +56,6 @@ void Hero::Update(int delta_time)
     ++updated_times_;
 }
 
-void Hero::GetAabbBox(AabbCollider& aabb_box)
-{
-    if (!meta) {
-        abort();
-    }
-    aabb_box.active = true;
-    aabb_box.owner = this;
-    aabb_box._min.x = -meta->i->radius();
-    aabb_box._min.y = -meta->i->radius();
-    aabb_box._max.x = meta->i->radius();
-    aabb_box._max.y = meta->i->radius();
-}
-
 float Hero::GetSpeed()
 {
     float speed = meta->i->move_speed();
@@ -193,3 +180,34 @@ float Hero::GetRadius()
 {
     return meta->i->radius();
 }
+
+float Hero::GetHitRadius()
+{
+    return meta->i->hit_radius();
+}
+
+void Hero::GetAabbBox(AabbCollider& aabb_box)
+{
+    if (!meta) {
+        abort();
+    }
+    aabb_box.active = true;
+    aabb_box.owner = this;
+    aabb_box._min.x = -GetRadius();
+    aabb_box._min.y = -GetRadius();
+    aabb_box._max.x = GetRadius();
+    aabb_box._max.y = GetRadius();
+}
+
+void Hero::GetHitAabbBox(AabbCollider& aabb_box)
+{
+    if (!meta) {
+        abort();
+    }
+    aabb_box.active = true;
+    aabb_box.owner = this;
+    aabb_box._min.x = -GetHitRadius();
+    aabb_box._min.y = -GetHitRadius();
+    aabb_box._max.x = GetHitRadius();
+    aabb_box._max.y = GetHitRadius();
+}
diff --git a/server/gameserver/hero.h b/server/gameserver/hero.h
index b6c4a48..98247dd 100644
--- a/server/gameserver/hero.h
+++ b/server/gameserver/hero.h
@@ -27,11 +27,12 @@ public:
     virtual void FillMFObjectFull(Room* room, Human* hum, cs::MFObjectFull* full_data) override;
 
     virtual void Update(int delta_time) override;
-    virtual void GetAabbBox(AabbCollider& aabb_box) override;
 
     virtual float GetSpeed() override;
     virtual float GetRadius() override;
-
+    virtual float GetHitRadius() override;
+    virtual void GetAabbBox(AabbCollider& aabb_box) override;
+    virtual void GetHitAabbBox(AabbCollider& aabb_box) override;
 protected:
     virtual void _UpdateMove(int speed) override;
     void InternalUpdateMove(float speed);