OK , the tabloid sensationalism of the yellow reporters aside..........
"Did you look away from the TV set when he ran up to Mariner in the first half brandishing an invisible card after a challenge with Downing?"
You mean after Downings dive? Deserving of a booking, however I do detest the waving of imaginary cards by players. Its the refs job to decide whether a player deserves a caution, not anyone elses.
As to the racism allegations, i'm expecting to see this end without any conclusive proof either way. Only the two players themselves will probably ever know if anything was said and what exactly that was.