for the first thing there was a post about that,and it was said that it worked just like it would,cant exactly remember.

but when i played with my firends mm i noticed this:when i played against someone who had mei and he/she had a barrier(which happens all the * time cuz his team has no ninjas with barrier skills)mm could evade her poison 2 nins (sry forgot name lol) but not get poisoned.interesting huh?