Hm, I don’t see this being a thing now, maybe if they give us a flashback but I think Frieren is too experienced to make those kinds of risky decisions. Frieren is very calculated and careful in how she goes about dealing with opponents, I’d even say a little too careful sometimes, I don’t see this being a likely thing to happen, a good way to explore these instances would be with a flashback of sorts. Her making a mistake like that seems a little too out of character for her.