The Aborted Clone is a half-complete experiment in which Athetos was quickly trying to create another Variant. The failure is found by Trace in Edin, and he has the choice to kill it, or watch it die on its own.
There isn't much Trace can do during this "battle". The Aborted Clone will not attack directly, but it will inflict damage on contact. Trace can either shoot the clone or wait for its inevitable demise.