Currently it is impossible to complete the second checkpoint solo as only 1 mote carrying knight will spawn after the first room. The time between the next knights spawn is 1 minute and 30 seconds making it impossible to get 5 motes to progress past that room.
Platform: Playstation
PS4 console
Unsure of where/how to upload video to link to this.
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Found out problem, one of the hobgoblin snipers had spawned inside of its platform.