It's not just TvZ the helbat drop is an issue in TvT. It is able to defend easily against everything and is very hard to defend.
Check out the 4-hellbat drop build on YouTube. http://m.youtube.com/#/watch?v=q-EEXUHdXOI&desktop_uri=%2Fwatch%3Fv%3Dq-EEXUHdXOI
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