If a warlock uses "Energy Drain" in combination with "Surge" the movement speed will be boosted, but if the player continues to sprint after the "Surge"-timer has expired, the movement speed will drop to a level that is below the original level (without "Surge"). So the player will be slower than usual until he stops to sprint and starts again.
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How did I never notice that? Used to primarily use surge! And is it a glitch that the 'grenades trigger energy drain' perk doesn't actually trigger the perks energy drain is supposed to trigger? Seems like it should be a glitch. Probably by design though.