[He considers this with all the seriousness of an architect planning his future home. She has a point; it's irresponsible to give sandpeople life, only to doom them to a watery grave.]

Something might still be able to sneak up on them from behind, though. I'm not sure what dinosaur crabs are like, but they're probably very unpleasant.

Maybe a full-blown mote?

[He points his finger and draws a line around the perimeter of the igloo, meeting her trench.]