Caliginous Form (The Sentinels) bug

In trying to unlock the Adamant Sentinels variants, I encountered a strange bug with Caliginous Form, Writhe's Signature Ongoing.

First, the card text:

"The first time Writhe would be dealt damage each turn, reduce that damage by 2 and redirect it to the Villain target with the highest HP."

Game details:

Grandpa Legacy, Team Leader Tachyon, The Eternal Haka, The Sentinels, Argent Adept vs Ambuscade in The Final Wasteland. Playing on my phone, iOS.

The bug:

Writhe's ongoing appeared to have a very loose definition of "each turn." I was attempting to incapacitate him myself, but Caliginous Form kept redirecting the damage, no matter what. The only way I was able to damage Writhe was when I had Tachyon deal damage to him multiple times during her Play phase (through HUD Goggles and Pushing the Limits).

The situations in which damage was redirected every time:

- Any combination of the following: Legacy played a card to do damage, used a power to do damage, or used a power to give someone else a power to do damage.

- Haka played a card to do damage, then used a power to do damage.

- Any combination of: Argent Adept did damage, gave power uses to do damage, or gave card plays to do damage (whether it was a power and a play to the same character or to different characters).

- Multiple environment targets attempted to do damage to Writhe.

It would appear that the card is redirecting the first time a target would deal damage, for each target, but it is also counting the Play and power phases as separate turns, as well a different character getting an out-of-turn play or power.

If there is anymore information I can give, please let me know and I will do my best.