Flick has zero situational awareness. The idiot blacksmith was shot down by the hydra, Flick jumps down to look for him, but then is totally "huh?" surprised when the hydra appears behind his back. He's such an amateur fighter. He should stay away from danger, for his own safety.
Also, the sword talks too much. Annoyingly much. A sentient weapon should only talk when necessary, like a weapon, unless it's actually the MC, like in the Fran manga (Tensei Shitara Ken Deshita).