The inclusion of the crossbow goes against the whole witcher lore, it's explained in the books that Geralt never used ranged weapons because he was extremely fast and had superhuman reflexes, could deflect arrows with his sword, and had the signs in case a ranged attack was absolutely necessary. He was even offered Nilfgard throwing stars ("orions" in the book), but refused to buy them, claiming that they are "impractical, because they make too much noise in-flight".