I just re-watched that scene... There's no such dialogue, and they do in fact walk off of holy ground to fight (Duncan stays in the cemetery and is safe as such). On the other hand, there are several versions of this movie so it may be in one of them...
And Kalas' quickening was supposedly "amplified" by the Eiffel Tower's metal structure, thus bouncing all over Paris and frying much of the electronics in range. In fact, it fried quite a bit MORE than that, as stock footage of stuff blowing up from previous episodes was re-used in it, including Macleod's TV back in the loft above the dojo, various lamps and light fixtures in Paris and "Seacouver", and Slan Quince's car from the pilot episode! Oddly enough, Duncan's barge seems to have functioning lights afterwards, despite being only a mile or two down the Seine from the Tower...
Though honestly, I'm wondering how many people Kalas paid off to look the other way so he and Macleod could have it out atop the Tower in the first place. It's not something you can just sneak up.
Mark