Going Down: Mickey and James
Mickey was a jock at heart, and he had the reflexes to match that description. In addition, he was a djinni. Like vampires, they were stronger and faster than their human counterparts. Without needing to think about it, Mickey followed James.
Perhaps vampires and djinn were matched in stamina, strength and speed. But, very simply, a pair of skis was no match for a snowboard. Skis were graceful and took finesse, while boards were straightforward and took speed. When you skied, you had to make turns; when you were on a snowboard, you didn't.
Mickey passed the group of skiers on the other side, knowing that he'd soon catch up with James.