Rat savior or off his meds?

I was dropping off some mail at the post box on my way to work and as I passed by the alley behind the Bang and Olufsen store on Burrard I noticed an animal cage/trap thingy with quite possibly the largest rat in the whole of the lower mainland in it. As soon as I dropped the mail off I came back around the corner to use the alley as my usual morning shortcut. As I rounded the corner, I saw that this crazy hobo had picked up this caged/trapped rat, threw it on top of his shopping cart of goodies and had taken off running down the alley…WTF was he planning on doing with that rat anyway? **by the way: it was not a pet cage, it was one of those traps with a way in and no way out**