Jayson Molumby is booked for dissent as he complains to the referee, who had awarded Birmingham a free-kick for Nathaniel Chalobah's push on Tahith Chong.
The game is won in truth - Birmingham will just to make sure they keep a clean sheet now to go with it.
Jed Wallace booked for swiping the legs of Troy Deeney as he shepherds the ball out for a goal-kick.
Frustration city for the visitors.
Deeney probably lucky to escape one a few seconds later as he hauls Darnell Furlong towards an advertising hoarding.
With 20 seconds left of normal time, Albion win a free-kick in the centre circle.