Last level of Durlag's Tower, party successfully fought the main foe. But our Lightning Bolts hit and Barely Injured a bystander called Dalton, he of course turned hostile. So I added this short piece of code to ensure that if he turned hostile then he would immediately return to being friendly:
(It was placed at the start of AR0516.bcs, when I quit and re-started BG:EE the attitude of Dalton immediately returned to normal.)
In BG:EE the foe won't use his secret weapon if you talk to him in a Paladin-type way. This makes the fight much easier.
Durlag's Tower has plenty of Ghasts, Ghouls and Carrion Crawlers, but a Free Action ring or weapon makes an NPC immune to paralyzation.