Cool Frog
Veteran
And he is contradicting a guy whose main method is Roux, one that is known for spamming of M slice moves
Regarding M vs M':
The direction of S is obvious. Clockwise.
As for M and E, it's not that I think they should be reversed (I don't care either way), it's just that I understand why they were established the way that they are. E goes from left to right, and M goes top to bottom.
What angle? M is clockwise... So is M' depending on the angle.