Yeah they still keep the ball that they didn't possess in that moment or recover so yeah rewarded, they lost a down, why the ***** wouldn't they it's treated like a recovery and if you recover the fumble and it's not a first down it's the next down. You're not suggesting you can fumble recover the ball and get a fresh set of downs? The defense doesn't get the ball because they didn't possess it, sure neither did the offense they lost it the ball went out of bounds and the rule in the regular part of the field rewards them with the ball back, but in the endzone it gives it to the defense.