One would wonder why Lord Voldemort would need captives at all. If he could easily capture muggles who otherwise were extremely well protected, why would he need them here? Also, why is he on the edge of a wood near Strathyre? He could sit on his throne at Hogwarts and truly be in a place he'd call home.
Also, the captives were much harder to comprehend than initially thought out. The Joker was giving the most trouble, as his memories flipped back and forth. Plans concerning destruction were valuable, but not much else. He was also impervious to being mind controlled, as his will was too powerful. Many of the captives minds were. Frank Castle, a 58 year old muggle who dons the nickname "Punisher", was also impervious to the imperio curse, and he was highly resistent to the pain manifested by the crucio curse. Prime Minister of Russia Vladimir Putin was also highly resistent, as well as a number of the captured terrorists such as Abu Doha and other criminals like Whitey Bulger and Jonathan Kramer(another double identity wacko, he calls himself "The Jigsaw Killer").
There were dementors also guarding the area, but they stayed on the sidelines as to not interrupt the memory conjuring process.
"Sir?" Eddie Eagle, one of the wizard sentries, tried to get the Dark Lords attention.
In his high clear voice, he looked up from perhaps the most dangerous of the captives, Ra's Al Ghul, whom Voldemort personally captured himself after a long struggle.
"Yes?"
"What are we going to do with the memories that we extracted?" He was terribly nervous, only a kid, and thus a little naïve enough to imply that the narcissistic psychopaths plot was convoluted.
Voldemorts face contorted into a slight grin. He replied
"Why we are using the memories to gain traction over the enemies who nearly defeated us in the Battle of Bargoed."
The Battle of Bargoed was a protracted urban battle between the Death Eaters and the Pyrrics, a splinter group of Death Eaters vying for control who turned and fled Britain as early as 1999. Many of them are in the United States and have a hit and run style of terrorism against Voldemorts legions. They have also made serious threats against discovering Voldemorts last Horcrux, something of which terrified the otherwise arrogant leader. The battle had cost the lives of at least 50 muggles, and brought the muggle government into a tailspin of fear and political repression.
