If you move about much you're likely to unsettle the clot and start it again.
It will, after a time, turn sour, separating like blood into clot and serum.
A clot of mud caught the knight on the side of his bullet head.
When the clot has separated, it is picked out with a needle, leaving the serum.
In short, the play is one clot of blood from beginning to end.
The clot ...