It's never been my favourate song, but on record it's a good vocal performance. I didn't attend the HAND tour so I don't know what it was like live. All I will say is that it's easier in the studio having multiple takes and being able to choose when you want to record it. There are also dozens of effects that you can apply such as pitch shifting, reverb, echo, etc which will always make a studio vocal recording sound better. On tour you don't have a choice. You're singing live so there's no touching it up after. Also as a singer your voice can't be perfect all the time. Jon could have had a cold, a sore throat, have just nailed Prayer, or his voice may be fatigued after playing so many shows back to back. All these factors will have an effect on what sort of performance he is able to put in.