diff --git a/server/gameserver/creature.cc b/server/gameserver/creature.cc
index 06f58630..5a121f1f 100644
--- a/server/gameserver/creature.cc
+++ b/server/gameserver/creature.cc
@@ -847,12 +847,27 @@ Skill* Creature::GetSkill(int skill_id)
     }
 }
 
+bool Creature::HasUseableSkill()
+{
+    for (auto& pair : skill_hash_) {
+        if (InternalCanUseSkill(pair.second.get())) {
+            return true;
+        }
+    }
+    return false;
+}
+
 bool Creature::CanUseSkill(int skill_id)
 {
     Skill* skill = GetSkill(skill_id);
     if (!skill) {
         return false;
     }
+    return InternalCanUseSkill(skill);
+}
+
+bool Creature::InternalCanUseSkill(Skill* skill)
+{
     if (skill->GetCurrTimes() <= 0) {
         return false;
     }
diff --git a/server/gameserver/creature.h b/server/gameserver/creature.h
index 24628e15..bb48c469 100644
--- a/server/gameserver/creature.h
+++ b/server/gameserver/creature.h
@@ -222,6 +222,7 @@ class Creature : public MoveableEntity
                                     const Position& target_pos,
                                     std::set<Creature*>& target_list);
     virtual bool CanUseSkill(int skill_id);
+    bool HasUseableSkill();
     void DoSkill(int skill_id,
                  int target_id,
                  const glm::vec3& skill_dir,
@@ -389,6 +390,7 @@ private:
     void CheckAbilityUsed();
     void AutoSwitchWeapon();
     void CheckLoadingBullet();
+    bool InternalCanUseSkill(Skill* skill);
 
 protected:
     bool need_sync_active_player_ = false;
diff --git a/server/gameserver/target_agent.cc b/server/gameserver/target_agent.cc
index 510af013..57faef7a 100644
--- a/server/gameserver/target_agent.cc
+++ b/server/gameserver/target_agent.cc
@@ -24,7 +24,7 @@ int TargetAgent::GetUniId()
 
 bool TargetAgent::IsValid()
 {
-    return target_.Get() && !target_.Get()->dead && target_.Get()->team_id == owner_->team_id;
+    return target_.Get() && !target_.Get()->dead && target_.Get()->team_id != owner_->team_id;
 }
 
 bool TargetAgent::IsDead()