Theda tucks the spindle away in her belt for the time being, and glances through the gate at Beelzebub. Well, he didn't seem to be saying anything, so they might as well proceed on their own instincts. The Theda-balor responds mentally to Nicos' request, including the others in her sending.

"I'm assuming that you mean, now that one living shield has been expended, will I provide another for you? We shall see. It's possible that there is misdirection magic at play here, but I am still drawn onwards down that tunnel."

Theda scoops up Morditai's remains and dumps them unceremoniously in the bag around Tonn's neck. Almost as an afterthought, she pulls a mask out of her pack and settles it over the dragon's snout. The two launch themselves into the air and lead the way down the passage.

Spoiler
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Theda puts the Mask of the Demon onto Tonn. His darkvision range is now...obscenely long. Something like 550'. She still has true seeing active.
Theda spot and listen as they proceed: (1d20+49)[50] (1d20+39)[49]
Tonn spot and listen: (1d20+16)[23] (1d20+16)[19]