Imagine this: three children playing on a set of swings in front of a school. If you look closer, you will see that they aren't really children, but young teenagers, possibly freshmen in high school. They are playing that old game wherein one person sits in a swing while another spins them around, twisting up the chain, then letting go, sending the rider into a fast spin.
One of the girls (for they are all female) is spinning another, and she's going fairly quickly as well.
Suddenly the girl in the swing begins to scream.
Everything stops, centers on that one bit of time, that scream.
The girl is caught in the swing chain.
The spinner keeps going for another third of a turn.
The swinger screams, "Stop! Stop! Stop!"
The spinner freezes.
Again the scream: "Stop! Go back!" The swinger is crying now.
The spinner unwinds the swing.
Too slow! Too slow! the swinger frantically thinks.
The swinger and the other girl, who had been watching, run inside the school building. Nothing's bleeding yet