I think both would be important. David wasn't doing the Watusi nor boogeying down at the local bar. He was leaping and jumping for joy (which is what the word signifies). It was by himself - he wasn't dancing in a quartet, nor dancing cheek-to-cheek and up close with a woman in public (what a husband and wife do in private is their business) - nor was he wildly flailing around "in the Spirit" looking like he was demon-possessed (yes, I have seen some people supposedly "dancing in the Spirit" and that is exactly what it looked like - it gave me the chills).