Either Nero or Dante can perform a launch jump off of ledges that sends them flying far forward, much further forward than a normal jump. This launch jump can be used to collect secrets and sometimes shortcut secret missions. To perform it, stand facing a nearby ledge that you can jump off of. Perform the Streak or Stinger attack (while locked up, press UP + Attack) and Nero or Dante will dash forward--the ledge cuts off the attack animation and instead launches the character far forward.