If you are beat, just tackle the WR. Don't let the guy get a long TD or a 40 yd pass play. What the hell is wrong with these guys? Has it ever occurred to them that 15 yds penalty is better than a friggin TD.
Kris Boyd may not have known that was a free play. Its much easier to see that flag come out if you're sitting on the couch watching it on TV. It was not his best effort, none-the-less.