Answer:
I save lives on the ground and in the air
I live off of a busy street if you want you can stay for an hour or two but if you don't pay rent I'll tell on you.
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
I like to twirl my body but keep my head up high. After I go in everything becomes tight
The thunder comes before the lightning, which comes before the cloud. The rain dries all the land it touches, wrapping the earth in a blood red shroud. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.