لَوْ رَأَيْتَ مَا حَدَثَ ...
If only you had seen what happened ...
When a conditional response is omitted, the audience may imagine the gravity, surprise, or scale of the event. Yet the particle law alone does not prove deliberate omission. The analyst must establish whether the response is absent and what contextual clue explains the effect of leaving it unspoken.
If several completions are plausible, none should be presented as the uniquely certain original wording. Ellipsis may imply a recoverable proposition, or its open-endedness may itself evoke awe or alarm.