I'll try that. As much I as would love to hear Wyll's dialogue, I'd rather continue my play through.
My party got caught trying to sneak kill the bosses, so the entire Shattered Sanctum is hostile (including Spike, obviously). I had Cloud of Daggers in a bottleneck position, so I didn't realize he was part of the fight until it was too late. I was surprised Wyll even had the option to Speak with Dead, given it was his spell that killed Spike.