Think I missed a mandatory caution yesterday, pen awarded to the blue team as the bule player goes to place the ball on the penalty mark a grey player walks by and appers to deliberately scuff it. I walked over to the penalty mark and couldnt see anything so any damage was minor so decided against a caution but I am pretty sure this should have been a caution for the grey player (making unauthorised marks on the fop) and a subsequent red card however as i couldn't see anything felt a speaking to was appropriate. No real complaints so didn't want to make trouble for myself especially as i'd already cautioned other players for simulation and not respecting the required distance at a restart but it had me thinking on the way home.