Terangi was about to **(spoilers)**
...kill himself, rather than live in a cell, when it seemed there was no hope of escape. Then, the guard cuts him down, so he goes with the flow and takes advantage! I love the fact that he was willing to die, though. In order, here's Terangi's view of his options, from most desirable to least:
1) Escape - and freedom
2) Death
3) Live in a prison cell (third, but a distant third; it was never really an option for him)
I just like that the movie didn't make it an escape plan from the get-go...he was really in the process of hanging himself!
"How do you feel?"
"Like the Kling-Klang King of the Rim-Ram Room!"