The clock resumes when the court either denies the motion or indicates a postponement of its decision until the trial. A motion under Rule 12(b)(6), like the traditional demurrer, tests the legal sufficiency of the complaint, counterclaim, or cross-claim.If no responsive pleading is permitted, a motion to strike must be made within 21 days after being served with the pleading. A party filing a motion shall at the same time file a memorandum of reasons, including citation of supporting authorities, why the motion should be granted. I served a crossmotion (or a motion to strike) together with my opposition. This Checklist addresses procedures under Massachusetts Superior Court Rule 9A, including complying with formatting, length, and content requirements. I am seeking clarification on filing a Motion to strike under MA Superior Civil Court Rule 9A governing the 9A Package? Cross motions, including motions to strike, must be served with the Opposition to a motion no later than 10 days after service of the Motion Papers. Mass.Sup. 3, ultimately quoting Miller, 448 Mass. A mistrial can be declared at any time in the trial proceedings.