I apologise I couldn't get a screenshot of this, but I was laughing too hard at how fast we were dying.
In Blind Well, Tier III, Heroic event. Currently spawns two giant Scorn, If standing on the steps looking toward the entry-exit point of the Well, the one on the left spawns a mountain, a veritable volcano, of Screebs. Screeb Pompeii kept taking out our team when what looks like dozens of screebs all spawn at once and explode in a display of grandeur that would make Gjallahorn go for counselling for its bruised ego.
As a final hurrah, the event spawns MORE Scorn once its completed, so you get to spend a rather disorenting time trying to figure out who the hell is trying to snipe your head off your shoulders while you're gathering your loot. RUDE.
Bungie, please turn it off and turn it back on again. And someone bring a flamethrower, from a distance, for pest control.
Maybe Telesto.
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Is it happening more than once, did it happen on a second play of the activity? This week's Tier IV/heroic bosses are Sikariis and Varkuuriis, their invulnerability shields can only be broken by Screeb explosions. So yeah a whole bunch of them spawn and respawn for that reason. Something might have gone a bit wonky in your session and you got an excessive amount of them. Let us know if it happens again, a screenshot or a vid would be perfect if you can.