Adam Clarke on Luke 24:15

And reasoned - Συζητειν, concerning the probability or improbability of Christ being the Messiah, or of his resurrection from the dead. It was a laudable custom of the Jews, and very common also, to converse about the law in all their journeyings; and now they had especial reason to discourse together, both of the law and the prophets, from the transactions which had recently taken place.