I love how the magical girls who are clearly capable of flight succumb to a pitfall trap as soon as they enter the dungeon.
It can probably be explained by some magic logic like Alice setting the dungeon to cancel out flight ability or whatever, but I still think it's kinda funny.
Also I see that we've grown the list of hentai kinks featured in the series this chapter. Probably the biggest number that's been featured in a single chapter since they're playing with all three girls separately at the same time.
They were were not in flight mode, they were walking on the ground, and the floor closed above them, so its not like they could just fly back...
But yeah, its still funny, and that's the whole point: They are so out of their elements, they fall for the most obvious tropes. Even Sulfur, who usually plays the straight man.