Ok who uses a literal pool of blood to bathe in?
Where do you even get that much blood.
Maybe it's not human blood, if everyone in this maze were eating some beef every day you might be slaughtering a cow every week and that might be a cow-sized amount of blood.
It's not literally impossible that there's some magic spell that would be activated that way, and the blood might come from volunteers, or from legitimate operations of war; but Abramo is beginning to think that he may have been fortunate in which side he fell in with. It's not strictly decisive, but... not a good look.