The Gargoyles might not have been able to stop Nina, but they were still having fun toying with the others. Even though more than half of their population had vanished like relics of lost time, those who remained, forgot about Nicole as she entered the tower and focused their attempts on taking down the rest of the warriors. Which was proving to be oddly successful.
The warriors were under a lot of problems. For starters none of them had AOE skills that could deal damage to aerial units. The best the warriors could do was to use elemental magic against the gargoyles. But even that had a problem, three of them actually. First, the mages needed to perform a long chant in order to use elemental magic and they could be easily interrupted during this time which would lead to them losing precious time without any benefit.