Help Needed: Christ Rose “Again”?

A friend recently sent a question and I thought I’d throw it out to the intelligent readers of CMR for an answer:

“In the English translation of the Creed we say that Christ rose again. There is no such Latin equivalent. Why, then, do we use the word ‘again’ in the Creed? It seems to imply that Christ rose from the dead at some point before Easter.”

Any ideas?