  Antinucleon production in heavy ion collisions is potentially an excellent
signal for unusual phenomena in hot and dense matter. However, at the low
energies available at the AGS the annihilation process must be handled with
care. In this Comment, we consider the case of Au + Au collisions at
approximately 11 GeV/c, applying the ARC treatment of pbar production and
annihilation to the analysis of experiment E878. It is apparent that classical
screening introduced for Si + Au is crucial in the understanding of data
obtained with the more massive projectile. Unfortunately, there seems no
necessity for invoking unusual behaviour in the Au + Au system.
