Yea it's shattering scream+ hell scream, discovered that last night but didn't fix. Will edit later, cleaning up some, fixing stuff, and will add a list of combos at the top(with descriptions at the bottom).

Fyrce I think you are thinking about the shatter+hell terror combo. Birds and tanks probably spam skills alot, so discovering which things do what combos is difficult with all the giant mass of combos usually going off.