Ryback did a spot where he put Antonio Cesaro in a classic Davey Boy Smith elongated vertical suplex. He probably had him up for a good twenty seconds before punk rushed into the ring with a double axe handle to break it up, but The Miz stopped him with a kick to the gut and put Punk up in an elongated vertical suplex of his own. This was an obvious pre mediated spot and looked really cool.
Ryback ended up holding Cesaro up there for a good 45 seconds whereas Miz only had Punk up for maybe 10 seconds or so. When they went to finish their suplexes in unison, Ryback properly fell backward and put Cesaro on his back in a normal, safe fashion, whereas The Miz literally dropped Punk straight down on his neck in a true, straight up brainbuster. I came out of my seat and in disbelief "you dropped him on his neck! What the f---?!"
Punk immediately rolled to the floor and the WWE trainer (looking concerned) immediately ran over to him to check on him. Punk was down on the floor for several minutes before slowly getting back up and making his way back up onto the apron in his corner where he spent the next five minutes red-faced with his arms hanging and resting on the top rope and constantly shaking his right hand and stretching it open and closed.
Up until that point in the match Punk had been very involved both verbally and physically, but during those five minutes on the apron he frankly looked out of it. My opinion is that he may have suffered what is commonly called a 'stinger.' To punk's credit, he did tag back in and eventually found himself in the ring with The Miz. They ended up outside the ring and Punk gave Miz a shin kick to the ribs that could be heard in the parking lot followed by a few stiff forearms to the head before rolling Miz back inside the ring.
Punk probably worked 2-3 minutes after that and Ryback ended the match with his finish on Cesaro. Punk quietly and slowly walked to the back, immediately holding the back of his neck the entire way and never looked back or played to the crowd.
This may be of some note as well. My fiance and I braved the wind and rain to stand outside after the event where the wrestler's came out to leave. Aside from Punk's bus, The Miz (with two other guys who didn't appear to be wrestlers, though one could have possible been Alex Riley as he is a fairly 'normal' looking guy) walked out to his car. He had parked very high on the ramp and was within 10 feet of us and he looked very down and out. Honestly, I didn't put two and two together at the time but I assume he got an earful from Punk and others. Miz looked like a scolded puppy as he put his gear bag in the back of his crossover. I said, "Hey, Miz, good match tonight." He said "Thank you, thanks a lot guys," but even his words were noticeably depressed.