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

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

src/server/game/Spells/Spell.cpp

@@ -719,6 +719,7 @@ Spell::~Spell()
 void Spell::InitExplicitTargets(SpellCastTargets const& targets)
 {
     m_targets = targets;
+    m_originalTargetGUID = targets.GetObjectTargetGUID();
     // this function tries to correct spell explicit targets for spell
     // client doesn't send explicit targets correctly sometimes - we need to fix such spells serverside
     // this also makes sure that we correctly send explicit targets to client (removes redundant data)
@@ -7855,6 +7856,11 @@ void Spell::DelayedChannel()
     SendChannelUpdate(m_timer);
 }
 
+Unit* Spell::GetOriginalTarget() const
+{
+    return ObjectAccessor::GetUnit(*m_caster, m_originalTargetGUID);
+}
+
 bool Spell::UpdatePointers()
 {
     if (m_originalCasterGUID == m_caster->GetGUID())

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;