Prepare an invisibility spell

Just in time you prepare and you cast the invisibility spell, they are disoriented, looking for something on the rocks, and after some time they continue their way to the southeast.

You notice more of them traveling the same way, but they don't notice you because of your invisibility. When you pass close to them with horror you realize the truth: They are not mounting bipedal creatures, they are female humans!!

The girls move carrying the small creatures on their backs. Their naked skin is stained with dirt and sweat and they have bridles of leather and metal. If they move slow, they whip their asses... this is so cruel... but it's not your world, not your problem.

One of the hooded creatures turns his head to you, but the hood covers everything except their eyes, you breathe... they can't see you... you must keep walking.

After an hours of travel shielded by your invisibility, the spell finally banishes but you see the mighty Mountains of Ash in front of you.