Beau's captor keeps him alive long enough to let him know the reason he's been kidnapped.  Apparently someone looks enough like him to want to steal his identity, and wants him dead for that, and hired this guy to make that happen.  This guy's name is Nathan, he tells Beau, and he also tells Beau (at length, in monologue format while Beau is gagged) that he's not going to do that yet, because he's going to take the chance to - practice.

Beau knows from the episode of Truth and/or Daring on the 1986 Venice Extortion that over 70% of people are involved in some kind of hostage situation, at least peripherally, at least once in their life.  Normally people turn out okay as long as they stay unobtrusive and only take escape opportunities when it's very, very obvious they'll definitely work.

It seems to Beau that this case is a little bit more serious.

He cooperates, with being restrained and then with trying to loose himself.  (He succeeds the first few times and then not for several after that, and then a bunch in a row again until finally he doesn't.)  He swallows courteously-given painkillers and then takes a tap on the head, not that there's much he can do about that, and he feels a little hopeful although mostly he's wondering why Nathan isn't just trying this out in a class environment.  There are more monologues; Beau is ungagged and asked for his opinions on everything from the 'accommodations' to government organizations and companies to Nathan's clothes.  When Nathan doesn't like his answer - which seems to be more about lack of thoroughness than any particular valence - Beau gets zapped with some sort of electrical gadget.  It doesn't hurt very much, but it gets him prattling into as much depth as he can think of pretty quickly.

The next day is worse.  It starts with a tap on the head, and when he wakes up from that there's an interrogation and then another, and when he wakes up from that there's an interrogation and then another, and -

It's evening, already, and he can't string together responses to the questions even when he can understand what they are, and he feels really bad, and at some point the fact that there's blood on his head makes its way to his nose, and he tries to keep it together but he keeps being shaken, and he throws up.  The attempts to get Beau to clean it up go very poorly.  Nathan gets mad enough that Beau could, in theory, learn that Nathan has been faking his British accent, if Beau weren't phasing between thinking that the difference means there's a new person in the room and failing to notice at all.

At some point things escalate to where there's a knife right there, up against him, and - he should not take it as obvious that anything will definitely work; his brain is not trustworthy - but then it doesn't matter because the gadget gets carelessly bumped into his side and makes him thrash involuntarily.