You can hear excitement in his voice for a big play, in general. He obviously is rooting for BYU, but will get excited at big plays the other way.
Bill Riley sounds like he is literally getting stabbed in the heart and the knife twisted around when something goes the other team's way.
Riley also says every call against Utah is crock. Greg Wrubell will comment on a crap call (like the "No, that's impossible" reference above to Bradley's knee), but doesn't whine about everything.