This is where mine has the advantage, LHP the screw or screw/drop is moving away from a RH batter.
With a LH slapper, her screw is coming across mid plate, then breaks sharply inside and down. Making the slapper adjust the bat path, or hitting off the handle. ( or sending someone to the ER in the case above )
Greenmonsters............Mine does have a good backdoor "curve". Last night in the second game of the double header she had 10 K's, six of those were backdoor curve final strikes. I really like that pitch.