Part of their problem was Percy. He fought like a demon, whirling through defenders' ranks in a completely unorthodox style, rolling under their feet, slashing with his sword instead of stabbing like a Roman would, whacking campers with the flat of his blade, and generally causing mass panic...-but Percy put a stop to it. He somersaulted over a line of shields and slammed the butt of his sword into Octavian's helmet. The centurion collapsed like a sock puppet.

pg. 139 SoN