How to blend between three animation with Mecanim.

I am trying to transition from state A to state B in mecanim and before this transition ends, transition from state B to state C.
I would like to interrupt the A->B transition and start the B->C transition right away but for some reason Mecanim waits for A->B to end and then it will transition to C. I have unchecked all possible “atomic” flags on the transitions and those are not solving the problem.
It seems to be impossible to interrupt a transition at the moment!? I thought this is what “atomic” was supposed to do.

I read the same.