It was not a choke. I don't think the Texans played the final four minutes scared or were tight. That is a choke. The Texans, especially their quarterback, made really bad decisions that cost them the game. Also you have to blame the O.C. for the loss as well.
I mean, why the heck are you trying to pass the ball with lead that late in the game? The coaches put the team in position to lose. That is a bad decision.
The examples you are providing are the reasons why I feel that the Texans choked. Remember. They played this game at home.