In the first edition of Speed is of No Concern, Double Pedal Coordination Exercises (1999), the emphasis is on playing basic patterns and mixed patterns which have been designed to develop a greater and more effortless independence between the different limbs. The standard rudiment on the bass drum is the single stroke roll and consists of alternating strokes between both feet! All the patterns that are described throughout the book are based on alternating strokes between both feet. Basically, Mirrored Drum Rhythms is an extension of Speed is of No Concern with the difference that the rhythms are more or less mirrored meaning that after every lead foot the next foot will be followed by a second foot and after every second foot the next foot will be followed by a lead foot. Mirroring can only take place between two or more rhythmic patterns. 
I would suggest that you start playing the exercises at a certain tempo until they feel comfortable. Play as long as it takes to get a good understanding of what you are playing. Remember that the snare drum and cymbal are just as important as the bass drum and are essential to complete an overall drum groove! In the exercises throughout the book the second hand of the snare drum is overlapped by a lead foot or a second foot. Make sure both limbs are rhythmically played well together.