unless im missing something this seems impossible. its the bit where you are told the president is trying to escape in his helicopter and you have to shoot the tentacles. i go outside shoot everything, the spawning things, the tentacle pods in the garden, the pods round the helicopter, the tentacles in the sky. there seems to be a tentacle pod missing as once i nearly shoot everything a timer starts and while im running round trying to find some tentacle pod i cant see anywhere, the mission fails. i even bumped down a difficulty level but it made no difference.