How bout them skins?

[DavidM]

so forgive me if I'm wrong, but I was under the impression that you couldn't review a non-fumble that was whistled down.

My understanding of the rule is that the issue is determining who recovered the fumble, which the refs don't usually do if the play is blown dead. However in this case it was clearly recovered by the Saints, so they get possession at the point of recovery.