Shing!

This one is not nearly as bad as it seems. You can do this on almost any stage, but I did it on level 2. Your combo is broken when you either get hit or don't deal out any damage within about 3 seconds. The way to counter this is by dashing with RB. Even if there are no enemies on screen or in the area, just keep spamming RB. As long as you do, the hit counter won't go down. The exception is when you go into a cutscene mid stage, which will happen sometimes. Also, you can do this on any difficulty, so don't stress too much.