He really took a lick.
Molina injury
The Official Site of The St. Louis Cardinals: News: Molina suffers concussion in collision
STLtoday - Molina removed on stretcher in neck brace
Bernie in the Pressbox said Yadi has told them that he is moving OK, but he is just dealing with the pain.
They are thinking he won't miss much playing time.
The Cardinals organization does not have a backup catcher, anywhere, if Yadi is out.