Im not a healer but i saw this MNK video where he just had the sprint aura on and just kept on hitting the healer the whole match and they won.
Im not even sure how the healer could have defended against that because even with sprint the MNK would sprint and still had enough TP to interrupt.
In top of that the MNK had some ranged attack that could nullify the healers sprint. And if that wasnt enough he used that MNK intercept (shoulder tackle?) ability whenever the caster got a little too far.
They dont even need to kill you. All they need to do is to merely hit you.