He was only in his Eternal form, disinterested in drawing too much attention to himself while there were still people who might interfere with his plans for the evening.
Truthfully, this was only partially about exploring Mirrorspace; he hadn’t touched base with her in too long and he’d have used any excuse to check in on members of the Court.
Checking out Mirrorspace and chatting with Hekate was just killing two birds with one stone.
Shanyume