The glycolytic fermentation beginning with the anaerobic conversion of glucose to pyruvate by the glycolytic pathway, continuing with pyruvate:ferredoxin oxidoreductase (PFOR) activity. This pathway is found in strict anaerobes such as Clostridia species. [ http://www.ncbi.nlm.nih.gov/pubmed/20692761 http://www.ncbi.nlm.nih.gov/pubmed/20395274 ]