[quote=@Onarax]
[@harinezumikouken]
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I took that more as symbolic, Winter told Weiss to picture her enemies. To Winter the enemies she had to overcome were Grimm, hence why her summon appeared in the shape of one. On the other hand Weiss sees her enemy as that Knight, which is why that sword appeared. They're not actually Grimm, the summon just manifested in the appearance of one. 
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[hider=This is still spoilers]
I find it interesting that, while most Semblances we've seen are singular and simple, the Schnee Semblance is even more complex than their weaponry. Not only can they use many different types of Glyphs to pull of magic effects far more complex than Dust (Movement control, Time Dilation, Manifestation, and probably much more), it's even directly hereditary. It makes you wonder about their family, or if other Semblances can be expanded in similar ways. It might be interesting to see Blake actually clone herself, Nora shoot lighting bolts from her hands, or Ruby dilate her own sense of time and pull a Neo.[/hider]