SpellManager.Cast("Claw") does not work and SpellManager.Spells does not even contain the ghoul's spells.
The LUA functions are protected so I am guessing they won't work either.
something like Lua.DoString("CastSpellByID({0})",12345); should work too. Edit:LegacySpellManager.CastSpellById(SpellID); // use this if you want to cast any spells not found in SpellManager.Spells.