Springett had arrived at the assembly hall around half war through the fight. But it was early enough for her to see Ray dealing with the students with his bare fist but not only that, when Ray was fighting, she noticed something.
If his fist were simply strong then Springett would have ignored it. Perhaps it was a simple strengthening spell, even more so if he was wearing some equipment, it could have just been enchanted to give him extra strength.
But when Ray fought against those students, he was hitting them in precise spots to knock them out. He was easily able to avoid blows and his movement was unnatural. Springett had seen these type of fighting skills before and these skills did not belong to that of a mage but more to that of a knight.