After three hours of practice, they had successfully proven Reiko's point about Study Groups being able to learn faster together than they could in class. Working together, they really could improve their understanding of a spell quickly, and the Witches were making visible progress every few minutes with the guidance of Wolfe and Flame.
The barrier field didn't have to be orange. It also didn't have to be a field around them. Depending on how they visualized and manifested it, [Flame Armor] could be anything from a haze of heat around them to an opaque blue or orange set of armour or clothing. The only constant was that it was actually made up of a solidified flame.
The continual draw of mana from experimenting with the spell for hours had exhausted everyone, so they called it a night and made plans to meet for the cafeteria's first serving times for breakfast and take a detour before potions class to explore the Library a little.