Page 2, Post #37. Watch from the beginning.
Brown was outside-most of the three WRs at the top of the screen. He blocks his DB hard, though the play is going in the opposite direction. Manjack was the second from the top, and he dances with his defender, making zero contact.
It's just ridiculous. Dead ball, no running clock, and offsetting personal fouls, so the first down pickup stood. No idea why Manjackoff was so determined to run all the way across the field to attack Brown, it could have led to another unsportsmanlike penalty that WOULD HAVE cost Houston 15 yards..