The left-back, 24, smashed his shoulder into his opponent's face during the 2-1 loss at the Amex Stadium.
Fans were left gobsmacked as Schelotto writhed in pain on the ground as the ref charged towards the action.
But despite appearing to have no eyes on the ball and all his focus on the player, Kolasinac wasn't even booked for his foul.
Schelotto was left needing oxygen and was eventually forced off the field, looking worse for wear as he returned to the bench.
But Kolasinac's ability to avoid an early bath didn't help Arsenal on the day as they succumbed to yet another defeat.
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Arsene Wenger’s trophies with Arsenal
Premier League: 1998, 2002, 2004
FA Cup: 1998, 2002, 2003, 2005, 2014, 2015, 2017
Community Shield: 1998, 1999, 2002, 2004, 2014, 2015, 2017
Brighton took an early lead through defender Lewis Dunk to pile the pressure on Arsene Wenger.
And things got worse when veteran striker Glenn Murray continued his good form with another deadly strike.
FINAL NAIL? Arsenal mathematically out of title race at earliest-ever stage under Wenger
Pierre-Emerick Aubameyang did manage to pull one back for the visitors on the stroke of half-time.
But despite being awarded seven minutes of injury time, Arsenal were unable to salvage a draw.
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