Inside the Tower of Justice.
The Straw Hat Pirates, including Luffy, had all been intercepted by members of Cipher Pol 9, while Cipher Pol 9's commander, Spandam, led Robin through the passage toward the Bridge of Hesitation.
On the main island, many people were trapped in front of the Courthouse—some were Marines, while others were Enies Lobby guards. The reason they were trapped was that the entire area outside the Courthouse had been blocked off by building ruins frozen solid into a massive wall of ice.
It was impossible to pass through from this side, and impossible to get in from outside.
Even so, the guards still upheld their duties, fighting the Franky Family and the Dock One shipwrights. They could not interfere with the battle at the Tower of Justice, but they could not simply abandon their responsibilities either.
"Hey, hey, hey, hey..."
Just then, Spandam's voice suddenly came through the huge loudspeakers in the center of the main island, echoing across all of Enies Lobby. Yet it did not sound like an announcement at all—more like he was talking to himself.
"Damn it, this is bad. This one's the regular Den Den Mushi. How could I be so careless?" Spandam's annoyed voice brought the fighting everywhere except the sea to an abrupt stop. "Of all things, I pressed the Golden Den Den Mushi... and activated the Buster Call."
"What stupid thing did you do? Cancel it right now!" Robin's panicked voice came through.
Neither of them seemed to realize that their conversation had been broadcast across the entire island.
"Cancel it? Don't be ridiculous." Spandam did not sound panicked in the slightest, instead sneering, "So what if the Buster Call has been activated? I'm the commander of Cipher Pol 9. I activated it to safely hand you over