Re: Yes, Andy Reid must have thought it was 3rd down or something

No, read up on overtime rules for postseason including Super Bowl.
Each team is guaranteed a possession.
If the first 15minutes run out, they go into the "2nd quarter" and the clock starts again.
If after both teams get their possession and they tie... then next score wins.

If the score remains tied even after the "2nd quarter of OT" they go into a short halftime and then another quarter starts again until somebody scores.

Chiefs knew what they were doing. Fans know less.