QA-MIS-3: I missed a mandatory on my drive, but we didn’t realize it until after I had made another throw. What do I do?

Your second throw was a misplay because you made it from an incorrect lie. It should have been made from the drop zone (or from the tee if there is no drop zone). Since you caught your mistake after a single misplayed throw, you don’t count or play that misplayed throw. Instead, you get one penalty throw for the misplay. Your next throw is from the correct lie for the missed mandatory. The penalty for missing the mandatory still applies since it was made before the throw that was a misplay.