It wasn't Oscar's finest moment
When I first saw it happen, I was kind of weirded out by all the rolling around and floor punching. All that energy expended on that instead of standing up. He could have gotten up. Just seemed like a short body shot that didn't look like it had any true impact. Compared to something like Cotto vs Foreman where Foreman's entire right side of his body contorted after that hit.
Real suspect, but hey, its his image