[BretMan]

Can't really comment on what the umpire saw or didn't see. Maybe he didn't see the catcher doing anything. Maybe he saw the catcher "grooming some dirt" and didn't judge it to be an attempt to actually erase the line.

All that aside, the rule is this: On the first infraction a strike is called if the line is erased by an offensive player, a ball if erased by the defense. A team warning is issued to the offending team.

A susequent infraction by the same team results in a ball/strike call plus the head coach and the offender being restricted to the dugout for the remainder of the game.

You mentioned the earlier call in the game, but it isn't clear if the catcher is on the same team as the batter who had the strike called.

If the catcher is on the same team, and is judged to be erasing a line, a ball would be charged to the lead-off batter and the catcher and her coach would be restricted to the bench.

If the catcher is on the other team, charge a ball to the next batter and issue a team warning.