Brendon undoes the chains (breaks the addiction) and the woman freaks at him (detox). He gets away from her for a few seconds and she's already chained up again (relapse).
The symbolism in this is great. The acting is sub-par. Panic! should stick to music XD
I really want to read The Curious Incident Of The Dog In The Nighttime again. I found it earlier today and read a small bit near the end, and it made me want to start it.