Unusual Play

[Theisey]

Well, I guess so. NF defines a fumble as loss of player possession other than by handing, passing or legal kick. Stripping a ball from a runner usually results in the ball becoming airborne and either being picked off or recovered after hitting the ground.
I just envisioned, based on the description, the ball being taken right out of his hands. Okay then.. Fumble!

But you're right, seems this play might have been the reason the NF changed their momentum rules for this year.