Stupid, thought Sam.  Obviously Rex had seen her in the airport, and waited for his opportunity.

Two tourists pushed past them, dressed in garish colours, with black leather boxes around their necks.  Cameras, Sam realised.  She heard a snatch of conversation: 'I couldn't believe St Peter's was so big.'  Then Rex pulled her aside, out of the flow of people, and pushed her against the wall next to a metal box that dispensed chocolate.

'Well?' he asked.  His face was flushed.  Anger?  Exertion?  It could hardly be the heat.  His moustache looked exaggerated, almost artificial.  Sam wondered what he would do if she tried to pull it off.

'I didn't follow you,' Sam told him.  'The Doctor sent me to look into the business with the flying gun.  You must have seen it on the news.'

'Ah, yes.'  Rex loosened his grip on her arm.  'Psychic investigators, wasn't it?  That was the rubbish your Doctor friend told me.  I didn't believe it yesterday and I don't believe it now'

'Well, it's true,' said Sam, as patiently as possible.  'You saw the news report?  The gun?'

'Yes.  A trick.  A special weapon, perhaps, that went wrong and turned on its owners.  Some might see it as poetic justice, but it is not a proof of psychic powers'

'Still, we felt we should -'

A twist of her arm.  'And you should be on the next plane back to London.'

'Or you break my arm in public?'  In fact Sam was fairly sure she could break Rex's hold without undue fuss, but she didn't want an obvious scene any more than he did.

Rex let her go.  'OK, stay then.  But if I see you anywhere near me again, I will take action.  Direct action.  You understand?'

You're bluffing, thought Sam.  She still couldn't take him seriously, after his ridiculous attempt at a pass in London, and his escape on a number 9 bus.  But she faked a nervousness she didn't feel, and agreed to keep away.

Rex stalked off into the crowd and hailed a taxi.  She let him go, waited for a while by the chocolate machine.  A small child appeared, put a coin in the slot, extracted a pale-coloured bar that said it was strawberry flavour.

Sam rubbed her arm, then reached into her pocket and looked at the address the Doctor had given her for the offices of the TV network RAI.  She needed to look at the original film, find out who had taken it, talk to them.

She set off, whistling as she made her way back to the still-disorderly queue for the taxis.