Board Thread:General Discussion/@comment-3391158-20170904153455/@comment-4010415-20170907122738

It seemed like she had to really, really concentrate on summoning to get the whole knight, rather than easily summoning it. That's not as useful in battle, since it's dangerous to stand still and focus really hard on making something appear while someone or something is actively trying to kill you. I think we were meant to believe she had been practicing up to that point, especially since she brought her rapier out in the middle of the night and then, when she finally summons the knight, it's daytime. Not only that, earlier in the episode, she was focusing and the sword slowly started coming out of the glyph, but as soon as Whitley distracted her, it shattered.

So, for now, it's not as easy as Winter summoning baby Nevermores or a Beowolf. She has to devote all of her concentration to it.

Still, it would have been nice if she had summoned it for a reason, like Nikoli said.

Another possible scene is one that I described a while back while I was talking about how the only thing that explains the White Trailer is the manga. Instead of having that awkward scene where Weiss moves the furniture around in her room, they could have had her look at her scar in her mirror, have a quick memory that briefly explains the White Trailer, and then, she picks up her rapier and we later see her summoning the very thing that gave her that scar. The reason for this is because she would be thinking about another time that her father was being controlling of her, trying to keep her at home, and now that she can summon the knight, she is using the tool that he once used to try to keep her at home.