L's room:

From his secret room, L could see how Potter returned, along with another person. Since his clothes were black and green, and he had that special symbol on his chest, it wasn't that difficult for anyone to deduce that this someone else was the Green Lantern. As did everyone else.

"You know the Green Lantern?" Keiko asked.

"No." Potter answered, "He's just someone..."

"Someone you arrested because you felt like it." the Green Lantern interrupted.

"You got yourself arrested?" Katie seemed to think this was funny.

The Green Lantern made a face as he heard Katie's voice echo, but shrugged it off: "So I understand you need help catching these bad guys."

"It doesn't bother you that her voice echoes?" Keiko asked him.

"Let's just say mister Auror here briefed me... briefly on you people." the Green Lantern explained.

"I didn't realize the Green Lantern would tell stupid jokes." L spoke, "But you're not the original Green Lantern, are you?"

The Green Lantern heared that, but he didn't know where it came from, until he turned to look at the computer screen, which had a large letter "L" on it.

"Is that this L character you mentioned?" the Green Lantern sounded amused, "I'm surprised you all work for a voice on a computer."

"He may be just a voice." Cain explained, "But he pays well."

This made the Green Lantern raise his eyebrows: "Pays well? You're all in it for the money?"

"Who's in it for what is not important." L spoke.

This caught everyone's attention, so L knew he could continue without any further problems: "We just received test results from the drugs we had confiscated."

"You mean Cattafi... I mean, Panoramix magic potion?" Potter asked.

"Yes." L explained, "And it's worse than we thought."

Everyone looked at each other, wondering how it could possibly be worse.

"Some of the ingredients seem exactly what you'd expect from a druid, but we found some traces that would suggest modern medicine as well."

"What are you saying?" Keiko asked, "Are they trying to make a new pill or something?"

"If they are, I am not sure what it's supposed to cure." L responded, "However, it would appear that, unlike what Panoramix used to brew, this is less stable, and would destroy you."

"The epitome of cruelty." Caine remarked, "Making people feel stronger while slowly killing them."

"Our last surprise got four task-force members killed." L reminded them, "And seeing what the stakes are, we cannot afford any surprises for our next trap."

"Hang on!" the Green Lantern started, "You're sending us to our deaths?"

"The last task-force didn't have people like yourself in it." L explained, "They didn't know magic, only had a cop's training instead of that of a hitman, they didn't have any of your abilities."

"You forget to mention that these people have humanoid animals on their side." Katie hissed.

L was about to lose patience: "Using an airplane would be too conspicuous and a waste of time, so you'll have to use alternate means.

The Green Lantern showed his rings: "Not a problem."

"Can't we just do your disappearing act again?" Keiko asked.

"It takes a lot from me to have to transport all five of us at once." Potter answered, upon which he walked towards the window, where he had appeared before, and picked up something that looked like a broom, "And with this, I might be able to carry just one of you."

The Green Lantern seemed to have found a solution: "I think I know what we can do."

"Which is?" everybody asked, almost inunison.

"Just tell us where to go, L." the Green Lantern told the computer screen.