1. If the assignor assign to two different persons, the question arises as to which one has priority. The english rule is that the first assignee gets first dibs.
2. Until the obligor has notice of an assignment, the obligor can discharge his or her obligation performance to the assignor. Meaning, if Brower is not notified by Horton that her rights was transfer to Khun. By paying Horton, she is discharge of her debt. Kuhn's failure to give notice to Brower causes Khun to not be eligible for the money.