He may not be Guts, but Faust is clearly superhuman. No mere mortal will ever be able to knock five incoming crossbow bolts out of the air with a single claymore (huge, heavy, slow, imprecise) swing. The best human soldier in the world would have been a pincushion before he reached the enemy line... Then impaled on spears when he got there.
Gender isn't a factor when we're talking about an enemy horde -- including trained, experienced cavalry and infantry with crossbows and spears -- vs. one incoming swordsman on horseback.
In terms of combat realism, that kind of "one man army" bullshit is laughable. But no one reads stories like this for realism. They exist to provide silly but entertaining action and comedy.