Sudden Drop in Padawan Obi-Wan Damage Output

I'm curious if anyone else has experienced something similar to this.

In Grand Arena, I was using Queen Amidala with Padawan Obi-Wan, Master Qui-Gon, Shaak Ti, and Bad Batch Echo along with the current support (Krennic) datacron against a Rey team with Ben, General Kenobi, Cal, and Barriss and her level 9 datacron.

Instead of just hitting the AoE, I was trying to save Barriss for last to prevent the offense boost her datacron provides when she dies. This has always worked for me in the past, although some bad luck (way too many dodges) was causing the battle to drag out. Suddenly, the damage output from Padawan Obi Wan dropped substantially. Rey was either in the yellow or red (I think yellow), and Padawan Obi Wan's attacks caused almost no damage to Ben, while in the past his attacks would easily one-shot him at that point in the battle.

I'm curious if anyone else has seen something similar happen when you've used this counter. I've used it multiple times without seeing this, but like I said, it was dragging out this time, and it happened several minutes into the battle. When it happened I ended up timing out since I couldn't do enough damage to get rid of Ben, I couldn't kill Rey with him there, and I didn't want to target Barriss since I had already gotten the other two out. It feels like a bug unless there is some unusual interaction of the kits that I'm missing that would cause his damage output to suddenly drop substantially, where before he had already one-shot both GK (near the start) and Cal (with his first special, which can't be dodged, since Cal was must better at dodging than I've ever seen before). The support datacron should cause damage to continue to ramp up, there is nothing in the description that indicates it would fall off at some point (the buff to damage is "for the rest of the encounter").

UPDATE: I know Rey can give crit damage immunity when she uses Lifeblood if she is at full health, but she wasn’t, and I had multiple buff dispels available (one of the attacks that did very little damage came in response to Master Qui Gon’s first special, which dispels buffs on the target).