Duels: Vile Toxin Combo Failed to Trigger

Was playing a duel match as Rogue with Vile Toxin Hero Power.

Dropped a Worgen Infiltrator and then used HP on him and he didn’t get his combo bonus stats, clearly the combo should trigger since I played him that turn. It’s a clear board early in the match so nothing funky was happening that would have otherwise affected his stats. FWIW It wasn’t just cosmetic as it died next turn from 1 damage.

Notes that shouldn’t matter but might help in tracking it down:

Client is running Mac OS.

I played this turn out quite quickly. Cosmetically, I didn’t see the Hero Power go gold, but that might have been timing as much as anything.

My passives were: Pillage the Fallen and Hagatha’s Embrace (which had not targeted my Worgen)
Opponents were: Hold The Line and Battle Stance.

Play History:
First turn:
Opponent played Priest quest and attacked me for 2.
I played coin and Bloodsail Raider (which was 3/4 from Hagatha)

Second turn:
Opponent use HP to heal himself (and draw) and attacked me for 2.
I played Hilt of Quel’Dala on Raider and attacked him for 6.

Third turn:
Opponent played Surly Mob (which killed Raider) and attacked me for 2.
I dropped Worgen Infiltrator and buffed him with HP. He got the poison but not the +1/+1. (He already had stealth)