Se Heon was the one who attacked first, which made Mi Young think that the boy is indeed serious with the battle. Mi Young realizes she had no choice but to attack as well, or she would look totally stupid standing on the battlefield not doing anything.
When Se Heon throws her another attack, Mi Young realizes he was using one of the Geo battle techniques he had learned from the Silent Dwarves.
The rock formation he made moved on its own as it tried to catch Mi Young who was lucky enough to dodge it.
"Sh*t. It's fast." Mi Young whispers to herself as she tries to get away from the huge hand formation who kept on following her and crashing everything on sight. "This is not good."
Aside from that, she can't seem to land an attack because the rock formation just keeps on coming, which results in Mi Young running all over the field.
