Smugly and with bravado. These guys are rivals for the party to hate, remember.

Give them a quest info dump from the old man in the inn about retrieving the gem of Amara from the nearby ruin. Finish, agree how much the party will get paid... And just before money crosses the table, enter the Order of Amazing Adventurers who hand the gem across, then spend the evening buying drinks for the party patronisingly and bragging about how much treasure they got from the ruin, impressing all the bar wenches and the town.