A/N: Bit of a change here; I've split the last chapter into two parts, hopefully built up a little more dramatic tension at the end here before delving straight into the resolution. I think it's quite a bit better, if I do say so myself. :)
"We're supposed to just sit here?" Sally complained.
"Come here, I think I can get...yup..." Larry muttered. He had been messing with the monitor on the console and suddenly the Doctor in his ridiculous hat appeared on the screen. "Hold on a mo'" Larry added, pressing a couple extra buttons. "There, now we've got audio and visual." Sure enough, Sally's brilliant boyfriend had done it! They watched the Doctor step to the edge of the pier.
"La'amera!" He shouted. "I order you to stop the hunt of this planet. Earth is a level 5 planet, and you have no right to be here!" He stopped, waiting for a response, but there was none. "Talk to me! You can't take my thoughts so...talk..." he trailed off as he realized his mistake. Spinning around, he looked back at the TARDIS, worry etched in his face. But in a moment, it was gone, as he stepped back through the police box doors and took the helmet off.
"What happened?" Sally asked.
"Hm? Oh, the psychic damper worked perfectly! Er, too perfectly, actually. See, the La'amera don't speak, as such. They project thoughts. By protecting my mind, I cut myself off from them."
"Well, there must be something you can do," Larry mused. "Couldn't you make it a one way damper? Y'know, they can't feed, but they can transmit their thoughts?"
The Doctor smiled, but only slightly. "I could, but it'd take too long. Now that they know why I'm here they won't stick around. We've got to act fast...what do I do, what do I do? Think think think think think..." The Doctor started muttering to himself, then shouted, "Odysseus!"
"What about him?"
"Odysseus didn't use the beeswax. He strapped himself to the mast, but he was basically vulnerable...Larry, put this on," he handed Larry the damper, and Larry obeyed. "I might, if I'm very very careful, I just might be able to communicate without the damper. Put up enough mental blocks to keep myself safe, for a while. Hopefully they'll play nice. But if things go bad, I'll need you there to pull me out." Larry looked nervous, but the Doctor did his best to reassure him. "Don't worry, you saw the damper works. You'll be perfectly safe, and you probably won't need to do anything. In the worst case, I have this," he held up a small remote, "and I can use it. Sally, don't leave the TARDIS. If I do use this," he motioned again to the remote, "you'll need to be inside to be safe. Or," he added to the ever-increasingly panicked Larry, "or safe inside the damper helmet. Honestly, it'll be fine. I promise." Before Sally could ask what, exactly, 'this' was, he motioned Larry to follow him back out, and the two stepped, grim-faced, onto the pier. Sally ran back to the monitor to watch.
"There now!" He shouted to the Sirens. "Just me and you. Well, and Larry. But never mind him, because right now, I need you to talk to me." There was silence, then, "I know you crashed, but that doesn't mean you can stay. I can take you home." The Doctor suddenly screamed and clutched his head, Larry moved towards him, ready to drag him back to the TARDIS, but the Doctor put up a hand as he focused his mind, sucking in air through clenched teeth. "You could have just said no. But I'd rethink that if I were you, I really would. Because if you won't leave peacefully, then I'll have stop you another way. And you don't want that." He held up the remote. "Do you know what this is?"
The Sirens didn't seem to want the Doctor's explanation, as they chose that moment to dive from the rocks where they were perched. They bared vicious fangs as they swam the few metres to the shore. Larry took a step towards the TARDIS, but the Doctor remained in place, his face stony. He held up the small remote, but before he could do anything more, he collapsed screaming onto the ground.