Sherlock immediately heads for the nearest frog-free area, although she has some difficulty walking without help.
Bella insinuates herself under Sherlock's arm to serve as a crutch; she's nibbled but not in a way that impedes her movement much. "Ml-" she starts, but nope, apparently even spell words produce frogs; this one is small and pinkish-white.
Unless Sherlock has a better idea Bella will aim for the tunnel with the lowest ceiling, as it seems like it might be unappealing to bat-things.
The frogs thin out as they proceed.
When they pass the last visible frog, Sherlock says testingly, "Frogs?"
Frogs! She gets four of them, apparently talking about frogs yields bonus frogs. They're all very little, though, cute little yellow and brown frogs.
Bella laughs helplessly. Apparently laughter is sufficient to produce a poliwog, which she spits out unhappily.
When they have left the poliwog behind, Sherlock says firmly, "Mint."
"Mulaglarby mulaglarby," mutters Bella, and then she seizes Sherlock's hand and repeats herself. "Why mint?"
"I love you," laughs Bella weakly. "Let's - will it interfere with you being ready to fight more nasty monsters if we hold hands, I think that would make it harder for the cave to split us up again."
"It will not interfere," says Sherlock, "but I may need to drop your hand quickly if we come upon something sufficiently unpleasant."
"Okay." Bella takes Sherlock's hand. And as an afterthought produces a water bottle from a sleeve to rinse out her mouth; she offers it to Sherlock after she has spat frog taste onto the tunnel floor.
"This cave," says Bella flatly, "is full of unpleasant surprises."
There are six wizards in the cave and they're huddled around a large scroll muttering to each other.
The entire exterior surface of her armour catches fire. She draws her sword, and that lights up too.
She heads for the wizards.
The wizards are unpleasantly surprised.
But not for long.
When the wizards have ceased to be surprised, Sherlock lets the flames die down and sheathes her sword. She turns immediately to Tony and Bella.
Bella has gotten Tony's hands untied so Tony can work on her own feet and now she's picking at the knot in the gag.