"man she's riding slightly fast then us, what should we do?"
"lets come up with a plan of dividing our men and exchanging them at set points during our travel"
or you guys could just ask her to slow down slightly....
@MinecraftNoob @Doomer
"How could we be rude enough to instruct the friend of the goddess, which is another goddess in human disguise."
Is probably their thinking, so rather than being a burden and slow down the "goddess" they forcibly strain themselves. Its the thinking that the goddess comfort is more weighty than theirs as human.
The idea is that Kaoru is acting stubbornly on her own against all advice, so she wouldn't care that everyone else can't keep up.
If she slowed down for them, that just gives them the chance to try and convince her not to go into a battlefield, and Kaoru doesn't want to have to deal with that. Also, it would mean it'd take longer to get there because everyone wouldn't be pushing their horses to the limit.