Things didn’t go BJ Penn’s way against Frankie Edgar, who stopped Penn in the third round via strikes during TUF 19 finale main event.

After the fight, during the in-cage interview, Penn alluded to his retirement from the sport. Here’s just a few of the reactions from the MMA world via Twitter.

I tell everyone @bjpenndotcom is my favorite fighter of all time. Thanks for being a martial artist and speaking out agains steroids!

— Cole Miller (@colemillerATT) July 7, 2014

Much respect to BJ Penn win, lose, or draw

— Anthony Johnson (@Anthony_Rumble) July 7, 2014

#GreatestLightweightFighterOfAllTime = @bjpenndotcom, #Respect big homie…#TUFFinale #TUF19 #TheOnceAndFutureKing

— Benson Henderson (@BensonHenderson) July 7, 2014

One of the greatest @bjpenndotcom one of my idols thanks for all the great @ufc fights

— FranCisco Rivera (@CiscoRiveraUFC) July 7, 2014

BJ is probably my favorite fighter off all time because of his just scrap that makes this even harder to watch

— Ike Vallie-Flagg (@IKEVF) July 7, 2014

Fuck…

— russell doane (@RussellDoane135) July 7, 2014

Damn that hurt my heart to see Penn like that

— Will Brooks (@illwillbrooks86) July 7, 2014

BJ may have made the weight cut look easy but I don't think it really was for him. He just didn't look healthy

— Will Brooks (@illwillbrooks86) July 7, 2014

Who's bj penns striking coach for this fight? Whoever it is screw you because you ruined him! :/

— Cody Bollinger (@CodyBollinger) July 7, 2014

Damn, that was hard to watch happen to such a legend.

— MIKE RICHMAN (@MikeUSMCRichman) July 7, 2014

#Depression has set in. Still proud of my brother @bjpenndotcom.

— Joe Lauzon (@JoeLauzon) July 7, 2014

Thank you @bjpenndotcom for all the memories in the octagon!!! One of the greatest!!! #HALLOFFAME

— Ed Soares (@edblackhouse) July 7, 2014

BJ Penn has and always will be one of my all time favorite fighters.

— Evan Dunham (@evandunham155) July 7, 2014

The last of my era has retired. @bjpenndotcom will always have my respect and admiration. A true #hawaii warrior

— FRANK TRIGG (@FRANKTRIGG) July 7, 2014

@bjpenndotcom u are a living legend my friend. Thank u for all great fights. #TheChamp #Respect

— Manny Gamburyan (@MannyGamburyan) July 7, 2014

Damn… Completely dominated fight by @FrankieEdgar

— Raphael Butler (@RealThaSilencer) July 7, 2014

Please give BJ the come to Jesus speech right now please…lower your stance and come forward..I don't wanna see him lose like this this

— Brian Rogers (@BRogthePredator) July 7, 2014

This is hurting me to watch

— David Rickels (@TheCaveman316) July 7, 2014

Regardless of any outcomes @bjpenndotcom will still be one of my favorites of all time. Great fighter, guy, and friend. Mahalo BJ.

— Joe Ellenberger (@JoeEllenberger) July 7, 2014

Thanks BJ for this amazing career ! True legend always gonna be a fan !! #TUF19Finale #halloffame

— patrick cote (@patrick_cote) July 7, 2014

Fuck … No one talk to me for two weeks

— Ian McCall (@Unclecreepymma) July 7, 2014

Thanks for all the awesome fights @bjpenndotcom, one of the greatest of all time. @ufc @UFCONFOX

— Seth Baczynski (@Sethbmma) July 7, 2014

So much respect to @bjpenndotcom so amazing to have been able to watch him over the year #legend #halloffame @ufc #thankyoubjpenn

— Steven Siler (@Stevesiler) July 7, 2014

Bj looked pretty malnourished… There really was no need for him to comeback, always a Bj fan here!!! #UFCFightNight

— Mark Bocek (@MarkBocek) July 7, 2014

Hard one to watch. Frankie dominated. He looked great. Sad to see bj have a fight like that. Both guys , all class

— TJ Grant (@TJ_Grant) July 7, 2014

@bjpenndotcom your still the best!!!! @ufc

— Sean Soriano (@ssorianoMMA) July 7, 2014

Sad to see @bjpenndotcom to lose but @FrankieEdgar is a tough fighter as well

— Johny Hendricks (@JohnyHendricks) July 7, 2014

That was sad. Goes to show you that you can't take 3 yrs off and not train even if you're BJ Penn this sport evolves to fast for that..

— James Vick (@JamesVickMMA) July 7, 2014

I'm saddened to see this fight unfolding the way it has. @bjpenndotcom is a legend but just shell of what he once was :/ #TUF19Finale @ufc

— Bubba McDaniel (@BubbaTheMenace) July 7, 2014

Excited for Edgar, but heartbreaking to watch BJ go out like that!

— Louis Gaudinot (@LouGaudinotUFC) July 7, 2014

There are some people you just can't beat. Unfortunately for BJ Penn, that's Frankie Edgar – Beautiful finish – #TUF19Finale

— The Spartan (@EliasTheodorou) July 7, 2014

BJ was one of my favorite fighters when I was younger. Sad Day. Terrible Matchmaking

— Ben Askren (@Benaskren) July 7, 2014

@bjpenndotcom you are still the #TheProdigy and one of my all time favs! Both guys tonight are legends of the fight game! @FrankieEdgar @ufc

— Baron Corbin (@BaronCorbinWWE) July 7, 2014

And stilllllll a Legend in defeat BJ Penn y'all! #UFC

— Derek Brunson (@DerekBrunsonMMA) July 7, 2014