UFC welterweight champion Tyron Woodley, and UFC featherweight champion Conor McGregor had a bit of a heated moment Friday morning in New York during the UFC 205 early weigh-ins.

Footage of the moment showed Woodley walking past McGregor, who proceeded to eye down the welterweight champ as he passed by. Woodley recognized the situation and appeared to say something to the featherweight champ before walking off.

Shortly after the encounter, Woodley responded to a Tweet about the matter on social media, saying:

Highlight of the AM: Woodley nodding to McGregor, McGregor saying nothing, staring down Woodley and then a brief, impromptu face-off. 😳

— Ariel Helwani (@arielhelwani) November 11, 2016

@arielhelwani I said what's up then he tried to flex. Quickly he realized it was a NO FLEX ZONE💪🏼🚫Pretty much made him say what's up! JS

— Tyron T-Wood Woodley (@TWooodley) November 11, 2016

@arielhelwani Some of us are really about that that life! The quiet ones are the ones really from the slums. Don't make me go back.

— Tyron T-Wood Woodley (@TWooodley) November 11, 2016

This prompted McGregor to respond, saying:

@TWooodley @arielhelwani Twitter bitch you'll do nothing

— Conor McGregor (@TheNotoriousMMA) November 11, 2016

Woodley then responded with:

@TheNotoriousMMA Dude Im not them guys u deal w Homie! I'll forget the fight 💩 & go Ferguson! Focus on Eddie & never call me a Bitch again.

— Tyron T-Wood Woodley (@TWooodley) November 11, 2016

This isn’t the first time there has been an intense encounter between the pair. Earlier this week at the UFC 205 press conference, McGregor stated that he was coming for “all the belts” on the table, which included Woodley’s welterweight championship. The statement didn’t sit too well with Woodley, who once again stated that fighters at 170 have a different level of power than fighters at 155 or 145 do.

In addition, Woodley had some harsh words for McGregor in the past after McGregor called Woodley a “bum”. The welterweight champ responded by saying:

“You’re fighting in my weight, and you’re not in my weight. You’re fighting a lightweight in welterweight, and you might want to watch that brother. Because, I don’t think you want them problems. I’m not Nate. I’m somebody that’s going to hit you, and you’re gonna wake up the next day thinking about retiring.”