After Rick opened his eyes completely a whole bunch of people began to kneel on the ground, losing their strength all of a sudden.
Dean was the first one to fall on his knees since he was the closest person to Rick. He couldn't even bear to keep holding his sword due to that feeling of emptiness and exhaustion that was dominating his body.
'Damn it! What's happening here!? Why am I paralyzed and weak like this? Even my vision is getting blurry…'
Dean wanted to touch his eyes and body to see if something was wrong with them, but he couldn't even move his arms.
Instead of analyzing his own body, Dean decided to look at Rick once again and see what was happening to him. He knew that the sudden feeling that dominated his body had something to do with Rick somehow. He could sense a different element in the environment now.
He didn't know whether he was hallucinating due to his weakness or not, though. His mind was getting somewhat dizzy. He wasn't reasoning properly either.