Final answer:
After Lorraine quit her job, Robert stumbled over a rug and accidentally knocked over Louisa's work-basket.
Step-by-step explanation:
After Lorraine quit her job, Robert remained about an hour longer and then took his leave. As he was leaving, he stumbled over a rug, accidentally knocking over Louisa's work-basket. This indicates that Robert was in the same location as Lorraine when she quit her job.