Added more checks to death grip

src/scripts/Spells/spell_dk.cpp

@@ -1545,13 +1545,17 @@ class spell_dk_death_grip : public SpellScriptLoader
         {
             PrepareSpellScript(spell_dk_death_grip_SpellScript);
 
-            SpellCastResult CheckPvPRange()
+            SpellCastResult CheckCast()
             {
                 Unit* caster = GetCaster();
-                if (Unit* target = GetExplTargetUnit())
+                Unit* target = GetExplTargetUnit();
+
                 if (target->GetTypeId() == TYPEID_PLAYER && caster->GetExactDist(target) < 8.0f) // xinef: should be 8.0f, but we have to add target size (1.5f)
                     return SPELL_FAILED_TOO_CLOSE;
 
+                if (caster->HasUnitState(UNIT_STATE_JUMPING) || caster->HasUnitMovementFlag(MOVEMENTFLAG_FALLING))
+                    return SPELL_FAILED_MOVING;
+
                 return SPELL_CAST_OK;
             }
 
@@ -1560,14 +1564,22 @@ class spell_dk_death_grip : public SpellScriptLoader
                 Unit* caster = GetCaster();
                 Unit* target = GetHitUnit();
                 Unit* baseTarget = GetExplTargetUnit();
+                Creature* targetCreature;
 
                 if (caster != target)
+                {                    
+                    if (targetCreature->isWorldBoss() || targetCreature->IsDungeonBoss())
+                    {
+                        return;
+                    }
+                    else
                     {
                         caster->CastSpell(target, 49560, true);
                         const SpellInfo* spellInfo = sSpellMgr->GetSpellInfo(1766); // Rogue kick
                         if (!target->IsImmunedToSpellEffect(spellInfo, EFFECT_0))
                             target->InterruptNonMeleeSpells(true);
                     }
+                }
                 else
                     baseTarget->CastSpell(caster, 49560, true);
             }