“I definitely designed it as a love relationship… That was the relationship I tried to draw. I think I also tried to draw a feeling of belief that very few of us are complete unto ourselves. It’s quite a lovely thing… where two halves make a whole.” - Gene Roddenberry
Spock's expression never changed. He was wholly focused on closing the distance between them. When Spock thought he might be faltering, the image of Kirk drawing his last breath sent a fresh surge of strength into his legs.