Wrestling fans on Twitter have been reacting to the mystery opponent that Tony Khan booked to face Orange Cassidy during AEW Rampage.Cassidy defended his All-Atlantic title against an opponent of Kip Sabian's choosing. Kip said he'd be unable to face Cassidy himself as he was "injured" during Wednesday's Dynamite Diamond Battle Royal. Sabian and OC have been feuding since the former emerged to attack the latter during his title defense against QT Marshall.The opponent, tonight on Rampage, turned out to be former NXT Tag Champion Trent Seven. Trent was released with the closure of the NXT UK brand ahead of WWE's planned expansion into NXT Europe.Like any surprise debutant, fans took to social media to share their thoughts and feelings. Interestingly, some had not realized that WWE released Trent. Some, like the user below, went one step further to suggest that he had "turned his back on WWE."RWW@ryanlesko82Trent Seven apparently turned his back on WWE. He joined AEW. And is making his AEW debut tonight against Orange Cassidy.Trent Seven apparently turned his back on WWE. He joined AEW. And is making his AEW debut tonight against Orange Cassidy.okcguy@okcguy36@AEWonTV @trentseven Almost thought that was @EdgeRatedR@AEWonTV @trentseven Almost thought that was @EdgeRatedRYa Fav Nude Artist@JackGhostelTrent Seven on AEW?!1Trent Seven on AEW?!Pedro Tachiquin@petetachLast time we saw Trent Seven was I think NXT UK. #AEWRampageLast time we saw Trent Seven was I think NXT UK. #AEWRampageBrad Grayson the 1st (Bradcore Graves) (he/him)@realBradGravesTrent Seven? I didnt even know he was done with the #WWE #AEWRampageTrent Seven? I didnt even know he was done with the #WWE #AEWRampageDaniel, the Head of the Table😎@AzasGaming@melissax1125 @genmashoxx @TonyKhan Regadless, LFG! So happy that Trent Seven is soon gonna be #AllElite1@melissax1125 @genmashoxx @TonyKhan Regadless, LFG! So happy that Trent Seven is soon gonna be #AllEliteTuesdayThe10th 🐀🎃 xBLM x❤is❤@TuesdaytheTenth@trentseven is All Elite?!? Yes, please!!@trentseven is All Elite?!? Yes, please!!Will@AXEtheMercenaryI didn’t realize that Trent Seven was no longer with WWE! 🤯 #AEWRampage1I didn’t realize that Trent Seven was no longer with WWE! 🤯 #AEWRampageEZ@EZmoneyRCM18@airikalind Nxt UK Trent seven@airikalind Nxt UK Trent sevenTalon (OCs for sale)@TalonIsHollowTrent Seven on AEW? LFG!!! #AEWRampageTrent Seven on AEW? LFG!!! #AEWRampageThere was a general buzz about the Briton making his AEW debut. There were other reservations about Tony Khan bringing another former WWE star into the fold. But for the most part, fans were excited to see him return to their screens.What did you make of Trent Seven's AEW debut? Let us know in the comments below.