roughing the passer and change of poss.

[Niner]

I am confused. Could someone explain. "NOw, I have always been of the opinion that this is a change of possession. And of course, we then penalize from the previous spot with an automatic 1st down." I was assuming that this would be penalized from the end of the run regardless of change of possession. Example, A1 runs the ball thru the middle of the line where he is face masked. He continues his run for 30 yards where he is hit and fumbles the ball. B recovers the fumble 5 yards further down the field. The penalty of five yards would be administered from the spot of the fumble (end of run)and A retains the ball. Is this wrong?