I don't think Larcade is going to die that easily. I mean, there are other Spriggans who have died too, but Larcade was the son of Mavis and Zeref, I doubt Mashima will kill a character like that in that anticlimatic way without at least some reveal about his past... except if Mashima pulls a plot twist and Larcade is not really their child (who wouldn't be too surprising considering it's Mashima).
August is doing a lot better of what I thought, I want to have some faith in this fight, but considering the previous Spriggan battles, I will reserve my hype.