Former Celtic boss Ronny Deila was left raging by a crunching tackle on Gary Mackay-Steven during New York City's win over San Carlos.
The Scots winger was flattened by a reckless lunge in the final stages of his side's 1-0 CONCACAF Champions League success on Wednesday night.
Defender Pablo Arboine wiped Mackay-Steven out as he skipped down the line and Deila immediately leapt to his player's defence.
The Norwegian was booked for a one-handed push on the San Carlos player as a touchline fracas broke out.
Incredibly, Arboine escaped a sending off.
After the referee regained controlling of the players, he flashed only a yellow at the Costa-Rican.
Deila was appointed NYC boss in January, replacing former Rangers star Giovanni van Bronckhorst at the helm.
Mackay-Steven joined the club on a free transfer in June 2019 after his Aberdeen contract expired.
The pair previously worked together at Celtic from 2014-2016.
You can watch the full incident via our video player above.