Pandemonium broke out in Llanelli with giant No 8 Sione Kalamafoni sent off for punching Wales star Ross Moriarty during the Scarlets' clash with the Dragons.
What started as a bit of pushing between Scarlets lock Sam Lousi and Dragons wing Ashton Hewitt escalated very quickly into something unsavoury.
Players from both sides attempted to separate the pair but Kalamafoni came flying in during the URC match at Parc y Scarlets.
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The Tonga international squared up to Aaron Wainwright but Moriarty pulled his scrum cap off from behind.
Kalamafoni then appeared to lose all control and threw a punch at the Wales blindside.
Referee Ben Whitehouse had no option but to award a red card, while Moriarty got shown a yellow for his part in the fracas.
Whitehouse, after speaking to his TMO, told the respective players: "We've got players holding, you've (Kalamafoni) run in from nowhere and started it and made it a lot worse.
"You (Moriarty) have grabbed him by the skull cap and pulled him out. It's a yellow card for you, off you go. You've (Kalamafoni) thrown a punch and landed, red card, off you go."
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