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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There are three pairs of wizards and three shriekers to kill to trigger heroic. The wizards appear during certain transmission percentage stages 25, 50, 75 (you'll hear the scream). At each point, get out of the ring, kill the wizards, kill the shrieker, get back in the ring. Do this three times and then the spongy Ogre appears. Kill it. Profit. 👍