During the fight with the Duras Sisters.
Over the screaming of the red-alert sirens, Worf called, "They have found a way to penetrate our shields!"
"Lock phasers and return fire!" ordered Commander Riker.
On screen, the Bird-of-Prey's shields flashed as they absorbed the blasts with practically no effect. Charlotte's mind raced as she tried to recall the point at which Deanna took over the conn, and braced herself as they were bombarded with more torpedos. Her console made a strange noise and she had only a millisecond to duck her head out of the way before it erupted in a hail of sparks and she was thrown from her chair.
"Deanna!" Riker shouted. "Take the-"
"No, I'm fine!" Charlotte called, struggling back to her seat. "I've got it, Commander!"
"Very well; helm, get us out of orbit!"
Within seconds, Veridian 3 disappeared from the viewscreen, and Charlotte was left thinking about two things- celebrating her escape and worrying about the Klingon ship that was still following them.
As the ship was jolted again, Data called, his voice bright with panic, "Hull breach on decks thirty-one through thirty-five!"
"Worf!" Riker paused as the deck shook and the lights flickered. "That's an old Klingon ship. What do we know about it? Are there any weaknesses?"
"It is a Class D-twelve Bird-of-Prey. They were retired from service because of defective plasma coils."
"Plasma coils? Is there any way we can use that to our advantage?"
"I do not see how; the plasma coil is part of their cloaking device."
"Data, wouldn't a defective plasma coil be susceptible to some kind on ionic pulse?"
"Perhaps…" Data frowned, considering it, then brightened with enthusiasm. "Yes! If we sent a low level ionic pulse, it might reset the coil and trigger their cloaking device. Excellent idea, sir!"
"As their cloak begins to engage, their shields will drop."
"Right; and they'll be vulnerable for at least two seconds. Data, lock onto that plasma coil!"
"No problem!" Data answered in an almost sing-song voice. He hurried over to a bulkhead, removed a panel, and began rerouting circuitry at inhuman speed.
"Worf," continued Riker, "Prepare a spread of photon torpedos. We'll have to hit them the instant the begin to cloak."
"Aye sir."
"We're only going to have one shot at this. Target their primary reactor- with any luck, their warp core should explode.
"Initiating ionic pulse," called Data.
The bridge reeled once more, and Charlotte cringed and ducked as a console exploded and debris rained down on them. This better work…