fix(Core/Spells): Fix Lock and Load procs (#24795)

Co-authored-by: blinkysc <blinkysc@users.noreply.github.com>

src/server/game/Spells/Spell.h

@@ -585,6 +585,7 @@ public:
 
     Unit* GetCaster() const { return m_caster; }
     Unit* GetOriginalCaster() const { return m_originalCaster; }
+    Unit* GetOriginalTarget() const;
     SpellInfo const* GetSpellInfo() const { return m_spellInfo; }
     int32 GetPowerCost() const { return m_powerCost; }
 
@@ -621,6 +622,8 @@ public:
     // e.g. damage around area spell trigered by victim aura and damage enemies of aura caster
     Unit* m_originalCaster;                             // cached pointer for m_originalCaster, updated at Spell::UpdatePointers()
 
+    ObjectGuid m_originalTargetGUID;                    // unit target saved before InitExplicitTargets strips it
+
     Spell** m_selfContainer;                            // pointer to our spell container (if applicable)
 
     std::string GetDebugInfo() const;