Eminem watches as Jessie Reyez indulges in a bit of “method acting.” Eminem and Jessie Reyez discovered electric musical chemistry, somewhere prior to last year’s Kamikaze. The end result was a pair of intimate concoctions of varying nature, the two-part tandem of “Nice Guy” and “Good Guy.” The latter, which in some ways operates as Kamikaze’s unofficial closer, was one of the few selections to earn …