Charlie I would have moved mate, but the fact remains that if they had any form at all they should have not gone down since you were there first and obviously fishing the spot. Most of the good fish would have been spooked for sure, its a pity that most of these pricks are full on inconsiderate and dont give a f%$ k.
You could have put out a swag of blood based burley, might have made for some light hearted entertainment !!