Found the following problems doing the quest
Taelon Fordring, npc entry 1842
Mangos console errors during escort:
doScriptText source creature: 1842 , text entry not found=> -1001078
doScriptText source creature: 1842 , text entry not found=> -1001079
doScriptText source creature: 1842 , text entry not found=> -1001080
target for action_t_cast creature: 4494 , casting spell ?20822
EscortAI start with 0 waypoints ( missing entry in script_waypoint)
doScriptText source creature: 1840 , text entry not found=> -1001081
doScriptText source creature: 1840 , text entry not found => -1001082
doScriptText source creature: 1842 , text entry not found => -1001083
doScriptText source creature: 1842 , text entry not found => -1001084
doScriptText source creature: 1840 , text entry not found => -1001085
doScriptText source creature: 1840 , text entry not found => -1001086
doScriptText source creature: 1840 , text entry not found => -1001087
doScriptText source creature: 1840 , text entry not found => -1001088
doScriptText source creature: 1840 , text entry not found => -1001089
id 11625197, command 10, buddy 11626 not found in range 40 of searcher creature 11625
id 11625197, command 29, buddy 11626 not found in range 40 of searcher creature 11625
After killing the named guy in the tower Taelon just stand there idle, .npc aiinfo on him shows the follow
ScriptName: npc_taelan_fordring
EscortAI started for player Vian started with quest 5944
EscortFlags: Escorting, Paused