The growl in the first few seconds of Wreath is killer because it comes in right after this crazy drumroll, and its just so random. Definitly sets the tone for the rest of the album. Another great one off of Deliverance is around the 2:30 mark in Master Apprentices. They get done with all the complex riffage than a single guitar comes in with the next riff, than the other guitar joins, a drumfill, and then Mike does his growl. Another off the top of my head is at the begining of When. It starts off with a real clean relaxing melody and then out of nowhere Mike come in with this massive scream and the song starts. I really like those fast changes in mood, keeps ya on your toes, haha.