Justin Forsett scooted up the middle and lunged forward while a couple of Detroit defenders closed in to stop him. His knee hit the ground, but the Houston running back hopped up quickly and took off toward the end zone.
"I know now that I was down, but I didn't think I was during the play," Forsett said. "I didn't think my knee hit, and there was no whistle, so I kept going."
Forsett had nothing to lose by getting up and running — and unbelievably, the 81-yard scoring play stood. The officials missed the call, giving the Texans a touchdown, and Detroit coach Jim Schwartz inadvertently wiped out any chance of a replay review by throwing his challenge flag when he wasn't allowed to.
That was all Houston needed to start a second-half comeback, and the Texans went on to beat the Lions 34-31 in overtime Thursday.
"Sometimes it's better to be lucky than good," running back Arian Foster said.
AFC South-leading Houston (10-1) has won five straight — two in a row in OT — and if a handful of teams lose, the Texans could be in the playoffs by the end of this weekend.
The Lions led 24-14 in the third quarter when Forsett scored on his long run. Replays clearly showed Forsett's knee touching the ground around his own 25 — Detroit players even slowed up, assuming the play was over.
Forsett got up and ran all the way to the end zone.
Scoring plays are reviewed automatically — but if a coach throws a challenge flag like Schwartz did, the review is negated and an unsportsmanlike conduct penalty is assessed. So the touchdown stood despite obvious evidence it shouldn't have.
Detroit (4-7) still led 24-21 after Forsett's touchdown, and the Lions went up 31-24 on Joique Bell's 23-yard TD run with 13:31 left in the fourth.