All right, Kagome. This is gonna be a slightly complicated maneuver. 

She knows damn well that she's only here because of the sword, and that Sesshomaru can probably force her to drop it, and then kill her, if he tries for that. She also knows that this sword is giving her nothing, in terms of enhanced combat abilities, and that she probably couldn't kill an elderly cat with it.

He doesn't know that. 

She points the Tetsusaiga at him, as if she really thinks that she could use it to accomplish something, trying her best to channel confidence and gravitas and fury. Then she walks, as calmly as she can, to where Inuyasha is standing. 

" - hey. Take this."

"Right."

KAGOME'S ALIVE SHE'S ALIVE SHE'S ALIVE

It's actually really scary to give up Tetsusaiga. If she hadn't had it a second ago, she would be dead. She's even a little worried that the sword won't work at all for Inuyasha - that it's already made its opinions on who gets to wield it clear by refusing to let either Sesshomaru or Inuyasha pull it out of the pedestal.

She doesn't think so, though. She thinks - she hopes - that the pedestal test is something else. Maybe nobody can pull the blade out for themselves. Maybe it has to be given to you. She's not sure.

What she is sure of is that the sword wants to protect her, and the person in this room most qualified to protect Kagome is really obviously not Kagome.

"Protect him, too," she tells the sword, sternly, and then lets go and falls back behind Inuyasha.

"I'll be fine. You just watch out for yourself."

Serious nod. 

So the shield spell shielded her. "Feh. Another little joke from Father."

"Have no fear, Master Inuyasha! The Tetsusaiga must be powerful indeed, to thwart Lord Sesshomaru's poison claws! Now, try it out on Lord Sesshomaru himself!"

"Very well," says Sesshomaru, whose eyes are now glowing.

 "Let us see what the purity of the Tetsusaiga can do when wielded by a half-breed like yourself..."

"Against the equal purity of Sesshomaru."

And as he finishes speaking he TRANSFORMS into an absolutely gigantic lion-dog-monster with claws and fangs and an aura of poison that melts the bones where he stands (and probably everything else too, shortly).

Oh no.

(You know, that does explain how someone could both have a baby with a human and also leave a corpse the size of a mountain. She's just gonna go ahead and... never tell anyone that part of her brain was thinking about that.)

"All right, time to test this out!"

And Inuyasha will LEAP - and STRIKE - 

And the blade will bounce off Sesshomaru's hide.

Sesshomaru is going to attempt to take a bite out of Inuyasha! He is a less agile and a less maneuverable and so much stronger and not, in fact, at all slower.

"Not a scratch?"

GLOWER at Myoga. "I thought this sword was supposed to be able to cut through anything!"

"W-well... it is an heirloom from your father. You must believe in its power! And by no means release it!"

" - and now excuse me," he says, and jumps off.

Inuyasha will continue attempting to bonk Sesshomaru with the sword! "Bonk" is, in fact, the correct verb!

Huh. Is the protective power all it does? Or does it not want to let Inuyasha use it after all?

Either way, this fight looks like a pretty bad thing to get in the middle of. Kagome will fall back to the edge of the giant ribcage and try not to get stepped on.

While Absolutely Enormous Sesshomaru is basically going to melt everything. Oh, Inuyasha will make multiple attempts to whap him on the nose with blade or claws, none of which really work. So far as Absolutely Enormous Sesshomaru is concerned, all weapons available to Inuyasha appear to be absolutely useless.

However, Inuyasha is faster than he is in his present form. So the correct solution for Absolutely Enormous Sesshomaru is just to output enough poisonous mist that absolutely everything near him crumbles to dust, which will include, say, his brother, who he will attempt to swat with his claws while he's at it.

Jaken will fleeeeeee the scene, attempting to climb his way out of the ribcage of doom!

"Get out of here, Kagome!"

"I'm going!" And after that she's coughing too hard to say much else, but she is climbing. 

(She's still worried about what the poison will do to him? But she already gave him Tetsusaiga. It'll protect him. It's gotta.)

Inuyasha's current main activities are dodging and coughing, at least while Kagome climbs! He's taking the poison better than she is, at least?

Why yes, this plan does seem to be working. SWAT SWAT SWAT.

It is really transparently impossible for her to do anything, here, and climbing while trying to breathe as little as possible is even harder than regular climbing.

She's just gonna focus on hauling herself up out of the smog. Eventually she's at the top of the ribcage, and can stop to cough on one of the skeleton's massive armored shoulder pads.

Well, if Kagome's out of the way, time to see about his ability to superjump riiiight out of this horrible cloud of toxic -