Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
It looks to me like someone created a series of small animations of the ninja 'slashing' each letter. These were then time appended together with the appropriate offsets to generate the much longer animation.
You major complication will be dealing with the ninja becoming overlaid on top of the previous background. However a 'previous disposal' or 'cleared frame' type animation should be able to handle that complication. http://www.imagemagick.org/Usage/anim_basics/#cleared