Texans missed punt block could have been challenged by Colts?

Ultimately would be 4th down again, not automatic 1st down Week 9: Colts at Texans (video at :53) "The Texans looked to have got away with one," said NBC announcer Al Michaels, as the Texans snap the ball to eliminate the possibility of the previous play being challenged. On a 4th-and-9 punt, Colts