15 points
*
But the agreed exchange was “make a deal OR the demon would steal their souls” - no mention of the deal needing to be two ways to be valid. (or that’s my take, anyway).
3 points
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Contact law necessitates “mutual consideration”:
https://blog.goodlawyer.ca/goodlawyer-blog/what-is-consideration-and-what-does-it-mean-for-you
2 points