A WWE referee threw up the 'X' sign on RAW after a star collapsed. It has left fans very worried.The referee was worried about Roxanne Perez on WWE RAW tonight. Perez was facing none other than Nikki Bella, and the star had an incredible match. The bout even saw her pull off a huge upset win over the legend, thanks to the distraction from Raquel Rodriguez. This is developing into a bigger feud as Stephanie Vaquer has teamed up with Bella to face Perez and Rodriguez in the future.Unfortunately, during the match, things went awry. Bella slapped Perez across the face, and it looked like a hard shot. Perez then landed badly while selling it, but the impact hit her head. She actually looked hurt and dazed at that moment. She could not stand steadily, and this led to more worries about the star's wellness. Referee Jessica Carr, in particular, was very worried about her and made it clear.She threw up the X sign after talking to Perez, which is the signal to the backstage that a star is actually hurt. The match continued, but there were also doctors present at ringside. Now, it remains to be seen what's next for either star and whether Perez might miss any action due to the potential concussion. As of now, there's no word on the severity of the injury.There are already several stars out with injuries in WWEWWE has several top stars missing at the moment due to injuries or other reasons.Several stars are missing action due to injury.GuntherSeth RollinsLiv MorganZoey StarkRey MysterioChad GableAustin TheoryApollo CrewsJacob FatuElton PrinceKevin OwensPiper NivenWith so many stars absent, and if Roxanne Perez is also added to that list, the company could face serious issues. The next few shows should see some of the stars return, meanwhile.