Speaking as a Cas fan I'd say it was something and nothing...you see far worse most weeks and Sinfield has never been 'that' type of player...neither is Dorn for that matter. Similarly much as it would be useful for us to see him suspended (ideally until after the weekend of the 10th August
) his record should mean that he doesn't get too much.
Interesting thing is that it is so out of character for him...do you thing the pressure of how much he seems to be having to carry the Leeds team at the moment? This season is the worst from the other Leeds play makers for a long, long time (not having a dig, just how it seems with McGuire, etc) so maybe the workload is getting to him.