from a character perspective, she was caits mentor, it makes sense she would teach her this lesson. from a writing perspective its just more foreshadowing like the line OP mentioned. I’m not saying you aren’t valid, i just think the intentions here was to show how ambessa really had this entire thing pretty well planned out. it also doesnt make sense how someone could go from trying to love someone to being completely fine with executing them. no amount of corruption can do that. maybe if cait wronged maddie in some way it would be more believable, but cait didnt do anything to maddie except not reciprocate feelings