I said it then and I will say it again:

They were one of the few acts who had the whole place up singing, moving, bobbing what ever you want to call it and the singing of Prayer was very very loud, the loudest crowd participation of the night. Jon's voice was good plus he moved a lot!! So 2 months on shows he has some sort of issue, either physically in the injury sense or mentally in not wanting to move around and forgetting the words.