Lemme put a spoiler warning in case others check here-
SPOILER
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Ok, the thing about Edel is... you have to think of him as a wild animal you have to tame. He works under Brillhart and is loyal to him- but still has the tendency to maul whoever or whatever he thinks would pose a threat to his master, regardless of his master's wishes. Slip out that you know something that could compromise Snare? You're a threat. Do something that could compromise Brillhart? Threat.
BUT! Again- think of him as a wild animal to tame- if he does something bad, he has to be disciplined. Don't fall for his BS either.
So it's not simply just a matter of being mean or being aloof or being nice to him- it's a matter of setting proper boundaries with him, but at the same time, putting Snare's welfare a priority.
I hope that makes sense?