RE:U S listing
The only reason USAS is "up" more than USA.TO is that the last sale for USAS was 10 minutes before the close while the price was down a bit. USA.TO had more sales closer to the close when the price went up. I'm sure the bid and ask probably went up, but without sales on the US exchange. You'll find that the prices will stay in synch, and if they don't, people with the ability to arbitrage will quickly put them back in synch.