Ok lets try this then, Medivh start off with a Taunt to get it riled up before it can even glance at you. How ever if it tries to double team hit it with a Shockwave. After that relax up. Mary I want you to start off with a Thunderwave, however if Medivh goes down before he can taunt then use one of his own. Follow that up with a Confuse Ray, yet if you taunted first use Thunderwave. Finish off with a Psychic to pick it up and throw it around but if you have just Thunder waved use Confuse Ray.
Medivh: Taunt ~ Relax (Sub: Shockwave)
Mary: Thunderwave ~ Confuse Ray ~ Psychic (Sub: Taunt ~ Thunderwave ~ Confuse Ray)