User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E11 - Being Weiss Is Suffering - Impressions/Recap/@comment-26018514-20180104034439/@comment-173.191.64.176-20180104223805

No. Weiss doesn't not need to stay still to summon. At the end of Volume 3 she summoned the arm of the knight while moving. By now she should be able to summon the whole thing while moving.

Ok. Lets say you can't summon the whole thing while moving. She could have at least summoned the arm to help her out. Better to summon something than nothing.