Seems like everyone on the field goal team forget about the rules and just stood there.
Here’s more from the YouTube description:
Edinburg North’s 44 yard field goal attempt fell short, falling into the awaiting hands of Sean Landez, who caught the ball at the edge of the end line 9.9 yards in to the end zone. After maintaining his balance, he turned back for the return, racing down the sideline behind his blockers all the way in for a 109.9 yard Touchdown return! (Sharyland won 48-7)