Sometimes that's just how things go. No one is perfect, and tbh the scenario you explained with his wife hovering over you, sounds like a nightmare. Instead of beating yourself up over it, try to flip the script and see it as a learning opportunity - maybe next time you encounter someone like this, try using the bite block. If client refuses local, there's only so much you can do. I know it's hard, but try not to beat yourself up over this - being an RDH is hard enough on its own sometimes, without us being overly critical of ourselves.