Senna's arrow pierced the falling slime with ease. There was nothing that could be called a struggle in the interaction. The slime's core was punched through by the arrow, a thin coating of slime covering the arrow as it flew off to the opposite side of the room. Without the core's life force binding the slime, the still-falling mass spread out, splattering along the floor over a decent area. 

The exact same result occurred with the Poison Slime on the ceiling, something that had not even begun moving before it was struck. It was just sort of sitting on the ceiling, immobile. It didn't even seem like it was going to do anything. Odd. 

The last monster of the third floor, almost all of its ground stained with green and red, was the red slime that had spread itself along the floor. Its core couldn't be sighted from the distance Senna and Alexander stood at, but as Senna had loosed her second arrow, it acted.

It started crawling on the floor away from them, towards the second room of the third floor.

Huh. Apparently slimes know how to retreat. That's cute.