Duvrael is overjoyed, although he does not show such emotions, because in spite of everything he knows about hill giants, there actually seems to be something of interest to be found here. Matters of an occult nature, even, or so it seems, and the wizard hardly notices Doc slipping away until the others do.
Mentally directing his familiar Hiss to move, unseen, through the tunnels here, the yuan ti diviner himself sets off behing Doc and Kaligan.