Claw against sword and claw against shield. They use both hands to fight.
Shelia attacked the Small Knight with her left claw. Only for the Small Knight to protect himself with his shield. Then the Small Knight tried to counter attack. But his sword is stopped by Shelia's right claw.
The Small Knight is left-handed. Probably. That's why his sword is in his left hand and his shield is on his right.
Being left-handed makes it a bit harder it seems. Because Shelia rarely fought anyone who is left-handed. Maybe never.
They protect themselves with their right side. So if we attack them with our right, they might be able to counter it swiftly. That's why Shelia attacked with her left.
Not only left-handed warriors are rare, they are also used in the way right-handed warriors are fighting. And Shelia is not that much different than any other right-handed warriors.