The playoffs are where you make your legend. Jack Morris is a HOF candidate for in large part a stellar Game 7 in the World Series, Emmitt Smith has basically universal respect from GIANTS fans for what he did against them(229 yards in a winner take all regular season finale with separated shoulder). We all feel pretty good about judging guys when its one good game, so the converse is, you can face scrutiny for a bad moment.
If a guy is hurt, he's hurt, they know their bodies better than me. What I and most people here have an issue with is his zombie like demeanor while other guys were also battling some very serious injuries on his team. He's bummed out, he's depressed, he wants to withdraw, disengage, he shouldn't put weight on his leg, ALL FINE. Take your visor to the trainers room then, put some ice on that knee and don't look like the weight of the world is on YOUR shoulders because YOU choose not to play, while your TEAM is scraping.