For me it is ridiculous to suggest that a shot taken from 17 meters out makes Chambo responsible for us conceding. He tracked back really well on the resulting counter attack but, just as Tim points out, he didn't actually do too well in the last instance before the goal. I also think Gabriel should have got a lot closer to Barkley as soon as he saw Chambo was back to cover.
All in all, I think Chambo had a decent game, sprinkled with moments why I think he is going to be a top player. That run down the middle was fantastic, and had we had a striker a tad less cumbersome than Giroud he would have had an assist after a great sprint down the right followed by an absolute peach of a cross.