yes i do

what do you mean transfering of spirit ?

yes , we need to be on guard all the time, they can see us all the time, we can't.
our prophet had teach us daily ritual to protect as from the dawn till dusk and from the dusk till dawn. so we rely to Allah entirely.

not medium of air, they are created from the smokeless fire, plasma form, remember the avatar movie ? earth, water, air and ? fire. that explain the four stage of matter. Solid, Liquid, Gasses, and Plasma. we on Solid stage, they are on Plasma stage.

they are not immortal, some said in the ancient lore of the prophets of old. some of our kind actually make war to them around the time of prophet Idris. they could be killed and die . just like us