After the third pair of wizards have come out (Happens around 70% transmatting), for the love of all that is holy, step out of the zone.
Sincerely,
Everyone who knows how to turn the public event heroic
Edit: Killing the shriekers is what triggers the heroic event. If the transmat progresses enough, the shrieker basically opens and closes almost straightaway.
English
#destiny2
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Your not the boss of me. Sincerely, Everyone except the people who might be working for you.