[This takes place during Sly 2, specifically Jailbreak, so before Bentley was in a wheelchair]
After the events of The Predator Awakes, Sly and Murray were captured by Interpol and sent to a rehabilitation center in Prague, unbeknownst to the Contessa, you have escaped.
As you were making break for it, you spot…Bentley, the brains of the Cooper Gang, writing something in a journal.
“It took a sleepless night of data-crunching, but I eventually tracked down the location of my friends, locked away in the mysterious towers in Prague, at the moment, they are the unwilling guests of Interpol’s most renowned prison warden: the Contessa…”
“My friends are locked up somewhere within the clinic, and are slated for the Contessa’s Good Samaritan brainwashing, if I don’t bust them out soon, they’ll be working a 9 to 5 job selling shoes, and I’ll be out two best friends!…”
Bentley was worried about his friends, but he didn’t realize you have escaped.