According to the Week 7 video, this element within the claim for promissory estoppel is often the wild card when determining a case. According to the Week 7 video, this element within the claim for promissory estoppel is often the wild card when determining a case. a promise is binding if injustice can be avoided only by enforcement of the promise which does induce such action or forbearance the promisor should reasonably expect to induce action or forbearance