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Timestamp from Twitch — BLAST.tv Major, Champions Stage: Quarterfinals Day 1 at 6:49:05: https://www.twitch.tv/videos/1822964337?t=6h49m05s
I tried to search through community workshop practice maps (I assume it has been taken from there), yet didn't manage to find the exact one.
It is a de_dust2 practice map.
https://steamcommunity.com/sharedfiles/filedetails/?id=285709994
This timestamp matches the screenshot:
