"I have no wish to know you. Not after your little trick," he growls, stalking over to loom over the ghostly man. "If you don't wish me to expel you forcibly from my shop then you will leave. I can promise it will hurt."

Not that it would do much aside from temporarily kicking Ardyn out... Emet-Selch can't set wards against the dead or his own helpers won't be able to get through.