Is a strip a loose ball?

[MJT]

PS enforcement.

Rule 2 is the key.
Fumble - "is any loss of player possession other than by handing, passing, or legal kick.
Handing - "transferring player possession from one player to a teammate." Since it was not a teammate, we do not have handing, but do have a loss of player possession (fumble defn.), so 10-3 adn 10-4 say loose ball play and PS for basic spot.