An assassin with full tempo with a full sneak bar can m2 about 10 times, so thats probably what he/she did instead of the 3 skill.
I think it might also be that Amber has a really high tempo and spams m1 then m2 right after, not sure tho.
i just push m1 and spam m2. thats all and have 350% tempo. and dodging attack do not provide mp for assassins. i am a men.