Re: A hypothetical Sci-Fi conlang scenario

David Peterson would be the one to answer this one, but I'll try my best:

That they will form a pidgin is improbable. They already have a common
language: Vulgar Latin. Pidgins form when you stick a whole bunch of people
together without a common language.

The more probable situation is that it becomes very heavily influenced by
English, mostly English vocabulary, the situation that many European
countries are in. Still, the basic underlying structure would remain--it
would still be undeniably Latin--and the saturation wouldn't take over the
language (look at the Normans and the Saxons in England). That's assuming,
and it seems the case in your scenario, that the slaves have their own
communities. They might eventually yield to English, but if they have enough
power to overthrow their time-machine-technologically-advanced oppressors, I
do not fear for the viability of their language. (In fact, Latin could then
again be the language of a world power!)

Ben