There are lasers blocking the BAD hideout at the far right of the island, and there are lasers atop the tall building on Balding Avenue. Since you cannot get past these lasers without the Ultra Vision Goggles, you need to go around the ones on the building antenna (go left and then come back, using the grappling bowtie). This is part of rescuing the third spy.
There are electric windows (that turn on and off) on the building on Toupee Terrace. You can go from window to window to reach the roof. But you need the Laser Pen (from the first spy rescued at the docks) to cut the bars and rescue the second spy.
you need to be invisible.
Go to the electrified building on Toupee Terrace and rescue the second spy.
The first spy is in the vault through the door on the roof of the BAD headquarters. The second spy is in the attic of the house with the laser lights on Toupee Terrace. The third spy is in the green house of the building with the laser and the guard when you enter the place called 'Rooftops'.
The spy at the electrified building is the second spy you have to rescue, as they have to be saved in order. The first spy to be rescued is at the Docks, and when you save him, you receive the Laser Pen, which can cut through the attic window bars and reach the second spy.
You get the laser pen from the first rescued spy (at the docks), and use it to rescue the second spy (in the electrified building on Toupee Terrace). The second spy gives you the grapple bowtie, which you use to rescue the third spy on the rooftops above Balding Avenue.
Take the Laser pen and go to the electrified building on Toupee Terrace. Climb the windows by jumping when they turn off. Use the laser pen to cut the attic bars and save the 2nd spy.
After you climb to the roof of the electrified building on Toupee Terrace, the laser pen will cut through the attic bars. Then you can rescue the second spy. To use the Laser Pen, aim at the bars and move your computer mouse to the right.
You need the Laser Pen. The spy in the attic is the "second spy" to rescue, because the first spy you rescue has the Laser Pen. Get the Chameleon suit from Spyglass Eyewear, and rescue the first spy on the docks. Then you can come back to the electrified building and save the second spy. (see related questions)
After you climb to the roof of the electrified building on Toupee Terrace, the laser pen will cut through the attic bars. Then you can rescue the second spy. To use the Laser Pen, aim at the bars and move your computer mouse to the right.
He is in the building on Toupee Terrace that zaps you with its electrified windows. To rescue the second spy, jump up the windows while the power is off (it takes timing). At the top, use the Laser Pen from the first spy to cut open the bars.
The laser pen is given you by the First Spy that you rescue, at the docks. It can cut some forms of metal, but it only works in one spot, rescuing the second spy who is in the attic of the electrified building on Toupee Terrace.(see related questions)
If you mean the laser pen you use it to cut open the bars at the top on the building that electrocutes you on spy island to get the second spy.