Azriel's secrets
To add to this, here are two more moments that seem connected to Azriel’s secrets :
Azriel losing the snowball fight despite a 199-win streak (Sarah mentioned in a live that Azriel threw rocks at Rhys because he was so angry)
>“Your eyes are sad, Shadowsinger.” He offered her a grim smile. “I lost the snowball fight today.” Clotho was smart enough to see through his deflection.
Azriel’s mood after Solstice
>Three days passed with no word from Cassian. He’d been replaced in training by a stone-faced Azriel, who was more aloof than usual and wouldn’t even give her a smile.
>Rhys growled, “Allow me to make one thing very clear. You are to stay away from her.”“You can’t order me to do that.”
And earlier in Silver Flames, Nesta recognizes Azriel as just as committed to Elain’s safety as those closest to her
>“Eyes can be blinded,” Nesta said. “Not the ones under my command,” Azriel said with soft menace. Nesta met his stare, knowing he was the only one aside from Feyre who could truly understand her hesitation. He’d gone with Feyre into the heart of Hybern’s camp to save Elain—he knew the risk. “We won’t make the same mistake twice.”