This situation actually happened to DD's team last year. DD's assistant coach saw an illegal substitution violation in the last inning and held it until the end of the game (somehow expecting the blues to award the game to DD's team). The blues informed her that the rule had changed in 2012 and that a warning was the "penalty" for the first offense.
I guess coaches need to crack the spine on the rule book every now and then too, not just the blues.
