Sorry but you're clueless, already feared Shaman can't restomp Tremor, all you have to do is make sure it's destroyed at the same time you fear Shaman. If coordinating with your teammate is too hard, you shouldn't be able to fear Shaman nor his team.
YES tremor should counter fear. but right now its basically like a warrior constantly having deathwish up YOU ARE IMMUNE TO FEAR if your any good.
Shaman is easily fearable if you're any good, not the other way around.