619 Two interpretations are possible: (1) "when ye have finished congregational prayers", or (2) "when (on account of extreme danger) ye have to pass over congregational prayers altogether-even the shorter form indicated for times of danger." I prefer the latter, as it accords better with the following sentence, which allows you to remember Allah individually in any posture possible during the danger. But when the danger is past, the full prayers should be offered at the stated times.