If you don't have a save before triggering the summoning (or if that is too far back to want to revert to), you will need to send your save to support@larian.com, with a description of the problem (DKS
support page).
Unfortunately they are on vacation next week, so there will be a delay until they can fix your save.
You can not find Saul again after freeing him. I don't know where he goes, but he doesn't stay in High Hall. The only way to successfully complete the Thorn in the Side quest and get a quest reward is to kill Saul.
In XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
I accept quest from Tilian (forget the quest name) to kill Saul but I choose to free Saul because I learn that Tilian have desire to take control the leader with slander Saul
I played on PC, after free him, I can meet Saul in his house at High Hall, but still when you talk with him you can choose for leave him or kill him, he thank me for free him and he said he will stay in his house + always said "home sweet home"
yeah I remember I get this Xanlosch bug, I kill everything on the way at sentinel island with dragon form + human form then start to land in inner passage (northwest portal on sentinel map), inside I open 2 chest, one wooden chest one another is trap but still can have it but you must quickly jump for dodge fireball trap cause 2 times you get hit by that fireball you will die (my HP is 860)
after that go to the portal, when get cut scene frist meet with Xanlosch, his body appearance looks floating in the sky, he is not stand up in land) introducing his pet Isabela + end conversation should fight with his pet but it's missing I can't see his pet and I destroy the generator, cut scene again he summon two fly army(I forget the name) but after beat them there is no more continuation