The grin that Carlos gave in return was best described as fierce. It was a while since he'd been tested, as he didn't really spar with Buffy, and he found that he missed it. He was good at what he did, but he knew after being injured he needed to expand his repertoire. He wasn't going to get caught out again.

Of course, immediately after he thought that, he was caught out by Bo's trip (which was faster than he expected), and he ended up on the ground, flat on his back.