In terms of damage taken, Samsara was actually doing quite well. The damage from Darkness Boundary was negligible. It was a prime example of a skill that was effective for its ability to create openings through its crowd control effects.
However, despite being Blinded in Qiao Yifan's Darkness Boundary, Samsara didn't take much damage. It wasn't that Team Demeter wasn't trying. It was just that they had to respond to Samsara's answers.
With four characters blinded, most teams would scatter to make it easier to escape from the Darkness Boundary. Even if one or two were focused down by the enemies and delayed, the others would quickly escape and be able to turn around and help their teammates escape.
But this wasn't what Samsara did.
After being blinded, the four of them moved together as one unit. It seemed like a disaster in the making, but Jiang Botao's Empty Waves created a beautiful protective barrier for them with Nebula Wave Slash, preventing Team Demeter from reaching them.