Floppy Ernie was written for the 2015 Weber State Indoor Percussion snare line in order to counter bad tendencies with technique on paradiddle-diddle figures: particularly, the tendency to achieve the second note of the doublestroke with a very weak bounce as you lift the lead hand for the next accent. Players with this tendency look "floppy" on paradiddle and paradiddle-diddle figures, and there is a lot of uncertainty in second-note timing on the doublestrokes.
The doublestroke should consist of two powerful taps (even if the tempo precludes the use of two equivalent wrist turns) that occur completely before the upstroke for the accents. This exercise aims to establish the approach by starting with bucks (focus on a strong tap before the upstroke) before adding diddles that are more closed (requiring more fulcrum pressure) than the ones in the paradiddle-diddles. As the doublestrokes open up from the 16th-note diddles to the paradiddle-diddles, you should be able to apply more wrist turn to the doublestrokes, leading to a more deliberate rhythm, as well as the follow through to finish the doublestroke before worrying about upstroking to the next accent.