Safty or touchback

[Warrenkicker]

If the ball is caught or recovered by B inside their own 5 yard line then the momentum exception may be in effect. That is dependant upon the direction of movement by B at the time of the change of possession. If the direction of movement was toward B's endzone then the momentum exception is in effect if B goes directly into the endzone. If B does not get into the endzone directly but is moving laterally across the field then he is not awarded the momentum exception. And also if B begins to gain yardage prior to reaching his own endzone he will not be awarded the momentum exception.

8-5-2a EXCEPTION: When a defensive player intercepts an opponent’s forward pass; intercepts or recovers an opponent’s fumble or backward pass; or an R player catches or recovers a scrimmage kick or free-kick between his 5-yard line and the goal line, and his original momentum carries him into the end zone where the ball is declared dead in his team’s possession or it goes out of bounds in the end zone, the ball belongs to B at the spot where the pass or fumble was intercepted or recovered or the kick was caught or recovered.

Your original play was a safety.