MMS are supposedly here to help keep the flow going but most folks don't realize is they are here to make a profit as well. It just seems for the last few months or year there are a few MMs that are taking advantage of their position and screwing a lot of investors by manipulating the hell of it. If you had L2 you can see the ASK price and the BID price and if you SLAP the ASK will never know what you are going to get. It will be ASK price at Green or red anywhere between the Ask price and the Bid price all in red to make it look as its a sell.. Also that is when you will see 5 and 6 digit trades happening... It really is BS that they can get away with that crap..