Grrr - they know exactly what they're doing! You set your flash up, persuade one of them to sort of stay still for you, hoping that where it decides to stay still is roughly where you pointed the flash... meanwhile, you try to get horsey and sunset in the right place - but horsey mates sneak round the back and knock your flash gun over! If they're not doing that they're having a good ol chew at your rucksack. Finally you think you've just about got it all sorted and the batteries in your flash decide they've had enough!!!
It's all just a game to them. Well, I took my ball home - that'll learn 'em. Hmph.