Frostmourne 3v3 how to counter MS effect

Hey all,

I'm not sure if I'm the only one experiencing this or not, but as I've been attempting to step into 3v3 lately I keep running into what I'm perceiving as the same issue.

Whenever we are facing a team that has a 50% MS debuff effect on it, whoever the kill target is get's dropped in seconds, mainly the healer. Healer is popping all defensives and still can't seem to keep up. I have no other explanation for why we are dropping so fast other than MS massively gimping the healer. How can the team help counter this?

Not much time to even peel to stop the opener. For example, if I'm on my feral druid I can't even get a second clone off if the first clone is trinketed before someone is dead. Could it be that since frostmourne is only on furious gear, that resilience is just not high enough? Maybe at the end of the day this is a learn to play issue.

Thanks for any help provided.