I've seen Maynard do extremely long screams like this live on multiple occasions, and I've also seen him pull away from the microphone while the scream continued. Screams can easily be enhanced and lengthened in a live setting with the use of delay. I personally don't see anything wrong with that. The purpose of long screams/growls in a song is to add to the music, not show off one individual's amazing throat muscles. Who cares if it's electronically enhanced?