Not exactly accurate... Wizards are out at 25, 50, & 75. What you have to quickly look for and kill is the yellow bars that inconspicuously spawn with them. Kill those AND the shriekers to get heroic.
Basis of claim, experience and this article;
https://www.usgamer.net/articles/17-05-2018-destiny-2-warmind-dlc-guide-release-date/warsat-down-heroic-public-event
Edit:
Might wanna throw that link into an edit... I’m seeing a LOT of misinformation in this thread.
So to be clear, you STAY in the ring, wizards spawn at 25, 50, & 75 of Warsat transmat, kill wizards, kill yellow bars, kill shiekers, get heroic, (hopefully) profit. 😉
English
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Wizards spawn at 71 the last time. As soon as they spawn, just everyone leave the circle, there's no need to be in it after they spawn.
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^This