Is this MLB or Pro wrestling?

Did you watch yesterday's 5-15 loss to the Marlins ?
http://chicago.cubs.mlb.com/NASApp/mlb/n...

In the 9th inning was an odd play that I was surprised wasn't in the highlights reel, just because it was so odd.

Corey Patterson was stealing second and was called safe. The infielder had Corey's ankle or foot and held onto it causing him to hop to maintain his balance (and probably avoid an injury) and then he was called out since he was off the bag while a "tag" was applied. I thought Corey accepted the call quite well.
Was wondering "What would Kyle Farnsworth do?".

If plays like this regularly result in a call like this, I think MLB is going to add some pro wrestling fans during the season.

Does anyone know what the official rulebook states regarding a situation like this one?