Touchback or Down on 1

[baldgriff]

Just so I understand this and I am going to use an extreme case to make the point...

Defender intercepts the ball 5 yards deep in the endzone. The WR rather than tackle the defender picks him up and carries him out of the endzone droppping the defender on the 1.

Would you really call this play down on the 1 if the defender was making no effort to leave the endzone?

Just curious.

I had a play like this happen in a game this year. We called a touchback, because the defender was not attempting to advance the tackle was initiated in the endzone and was completed on the one.