قَالَ الْحَارِسُ: لَعَلَّ الْقَافِلَةَ ضَلَّتِ الطَّرِيقَ.
The guard said: Perhaps the caravan lost its way.
In this context laʿalla introduces a possibility rather than a confirmed event. Dropping it in a quotation may transform the guard's conjecture into what sounds like a settled claim.
Accurate rhetoric preserves both the strength of commitment and its source. Qāla al-ḥāris identifies whose uncertainty is being reported; the narrator need not adopt that uncertainty as fact.