I think I should take this time to mention the actual effects of Hustle.
Hustle is a "Can Be Enabled" ability. That means that, at the beginning of a round, you may activate it. However, in exchange for this, you must issue actions first. Dark Pulse already issued actions first, making things a little easier. However, note that Hustle DOES NOT REQUIRE AN ACTION. All you have to do is pick it at the beginning of a turn and issue your commands.
Conclusion: Dark Pulse, do you want Hustle enabled or not? If you do, it must last for the entire round. Regardless, you must reselect your second action. Then, Venser, edit your actions accordingly.