Saquist
Commodore
Hmmm.
It's possible the shields got up.
But I don't think it's likely. They took to many hits. 3 Attack ship firing three beams. I think we saw 6 hits total but Defiant was shaking like an epiletic seizure.
The Vorcha hit defiant maybe 3 times and I believe they could still raise shields.
When did we not see ships shaking like an epileptic seizure when under fire from ships of similar tech level?
The bug ships would individually be no match for the Defiant ... 2 of them yes ... 3 of them is tipping the scales into the bugs favor (although the crew was able to fight 3 bug ships and win at one occasion taking serious damage).
In any event, the main point was that the shields were not instantly penetrated like on previous ships but were on and holding against the beams in question and losing intensity rapidly (a barrage from 3 ships will likely drain your shields quite quickly if the opponent is on a similar tech development)..
I question that,
When Traveling to the Founder Home world they put 50 attack ships on Defiant to make sure she behaved.
I've put the Defiant as shown on screen in simulator. Defiant (tactically) is even superior to 50 attack ships. Without shields though Defiant doesn't withstand 3 attack ships, systems go out too fast.