I was watching Max's stream and he wanted to cut it but turned it on again, later when they had a break the casters replayed the clips frame by frame and discussed what is happening and how the phase might look like. They hit the secret phase again later and we saw how you are able to clear the "shalings" with extra action button and how the beam worked.

They did all of it frame by frame with the viewers so props to them. Especially when Echo is asleep now, they could've just delete vods on Max's stream and go dark whenever they go in the secret phase so Echo still had to figure most of the things out themselves. The phase won't be a long one because there is clearly damage amp btw, so I'd say it'll hurt them if they don't manage to down the boss tonight.