Azal is not a particular earlier clock-time. It signifies absence of a temporal beginning. A particular originated event has a beginning, so calling that very event beginningless would contradict its characterization.
An opponent can nevertheless propose something different: each movement starts, yet the succession of different movements has no first member. No individual originated event is thereby called eternal; rather, the initial boundary of the series is in dispute.
Thus “one event is eternal” and “there is a beginningless succession of distinct events” must be analyzed as separate hypotheses.