What hilarious about this is that Anisa's use of the fable doesn't even make sense here.
In the fable, a scorpion wants to cross a river but cannot swim, so it asks a frog to carry it across. The frog hesitates, afraid that the scorpion might sting it, but the scorpion promises not to and says that it would also die if it stung the frog on the river. The frog agrees to give the scorpion a ride, and halfway across, the scorpion stings the frog anyway, dooming them both. The dying frog asks the scorpion why it stung despite knowing they would both die, and the scorpion says "I am sorry, but I couldn't resist the urge. It's in my nature."
If she called Sam the scorpion and Ian the frog, then it would mean that Sam promised Ian something but then intentionally sabotaged it to the detriment of both of them. If anything, the roles were reversed.