This wasn't just part of the big battle that the Hive and the Fallen occasionally have at Skywatch, was it?
I don't believe it happens very often, but when it does, you get a load of spawns from both sides.
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I've had a simular thing on the Devil's Lair where as we started, we met up with the 2nd fireteam (unable to chat with though) and promptly started killing the fallen to get to the first no respawn point. As i get close to it i turn around and see so much mayhem. For every one we killed 2-3 took their place. An army of dregs n sharks with 6 captains and 2 handfuls of the guys who put up shields and 4 purple orbs teleporting constantly. I never saw this before and it was endless. But by the time we managed to get past it and entered the no repawn zone, the beta semi crashes and our connections boot us out.
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I had the same thing happen after the staring area for the strike but before you go inside
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No it wasn't we thought that for a while but, we tried doing during the Times it does occur. And your able to catch those battles around midnight PST or when the day and night cycle changes.