Toribash
PDD's are really low on the aggro tables and don't have projectiles, so they Infested terrans would have went for the tanks regardless
PDD, makes ranged attacks that can hit up, hit it. Until it dies. So, dropping 2/3 would of gave the tanks enough time to unseige and move, or kill the units needed to win the fight.

Combine this with the bioball, it might of worked.
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Love you guys. | Soɐd | Kiza | iRookie | Orko | TGS |
Zora | ViperTech

No, PDD stops ranged projectiles from shooting, unless he target fired the PDD with the infested terrans they would by default start shooting the tanks / bio instead of the PDD, as I have said the PDD is REALLY low on the aggro tables.
combine that with the fact that Infested terran don't actually have projectiles and you get PDD doing literally nothing.
PDD stops muta roach hydra BL corruptor and queen AA attacks against zerg

you clearly dont understand how PDD works
Point Defense Drone, the Raven poops it out.

EDIT: I'm going to MLG Anaheim finals day. w00t.
This is the Emergency Alert System. All normal programming has been discontinued during this emergency.
Shame there is no MLG in the UK, Sucks living here. *sigh*
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Love you guys. | Soɐd | Kiza | iRookie | Orko | TGS |
Zora | ViperTech

There is, but would be better going to see it live.
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Love you guys. | Soɐd | Kiza | iRookie | Orko | TGS |
Zora | ViperTech