Heck, you can even make light of it--which is what the Cardinals have done.
Yes, the impact of the hit caused his finger to pop off. He doesn't know the exact moment it happened, but I would imagine that his hand had to get caught in something as well, i.e. face mask, shoulder pads, etc., but anyway...
Johnson wrapped his hand up and finished the game Sunday opting to get the finger situation handled afterwards. The man just became a starter this season and must not have wanted to risk letting anyone else look good enough to take his spot.'
That, and he didn't want to let his team and the fans down.
So in honor of and in light of Johnson's finger giving performance the team is working on creating a foam finger--or half-finger ala Rashad Johnson style.