Smallish spoilers:
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Frankly I just killed him. I had a save game before I engaged him, so first I tried to talk with him and get his testimony. Second time I fought him and then played the judge. And you know what? KILL THE SUCKER. No matter whether you get the testimony out of him or not, it doesn't change the judgement much. You'd think that you could "blame him" for causing it all and then he'd get some punishment and so, but noo..
I tried all combinations and only one gave the MAX XP - find Karlat guilty. Rest were all small XP. So why to let the arrogant shmuck like Belial just "vanish" away? Smack him. So I went to him, did NOT cast protection, and summoned him. He came and said "Haha, foolish mortal, you forgot to cast your ptotection spells!", to what I answered "Haha, foolish demon, I did it on PURPOSE!" He was "purple" to me, but not really that tough, at lvl 15. Frankly I had read about him and was thinking that he's tougher. Also that fighter char of mine I planned a bit, so he's good in melee combat
