Speaking to Digital Spy ahead of the movie's release on Sky Cinema this Friday (March 12), Rose recalled how she had a very different approach to the questions she asked Andy McNab – who wrote the book the movie is based on – compared to her co-star.
"[Sam] had no qualms about asking Andy anything. We knew we could ask anything and would just get the answer. There's no sugar-coating, because he doesn't see the point, and doesn't read emotions about people that are uncomfortable or distressed," she explained.
"We know how to pull back, and go, 'Maybe that's a bit much'. But he doesn't. So my questions were more about relationships. Why would you get married if you don't feel love? What about this? What about that?"
She continued: "Sam was like, 'How many dead bodies do you think would be over there?' He was like, 'Oh, about a thousand'. 'How did they die?' 'Well, the best way to kill someone in the woods is with a…' I'm like, 'Guys! Guys! This is so intense!'.
"But Sam would ask all the time. He would literally be like, 'How would I kill someone with this?'... I'm just sitting there, like, 'When's lunch? I'm going to need some time to recover'."
One of the things Heughan did learn from McNab was how to kill somebody with a mobile phone, which is seen in SAS: Red Notice. But don't let his intense questions worry you, Rose added that Heughan is "so annoyingly a perfect specimen of what a man should be".
SAS: Red Notice sees Rose play the leader of a group of heavily-armed mercenaries who take over the Eurostar and threaten to blow up the Channel Tunnel, with suspended special forces officer Tom Buckingham (Heughan) the passengers' only hope.
She was drawn to the movie because of the "psychology" behind it where both the hero and villain are psychopaths, just at different parts of the spectrum, which she admitted being "so uneducated" about.
"You can be in this part of it, or on the very far end where you have the Ted Bundys and Jeffrey Dahmers and people that had impulse control and other kind of things going on," Rose noted.
"But there's also a huge amount of people on the spectrum that have normal jobs and normal lives. They have children. They're married. They're great to be around like, obviously, Andy McNab. He's such a funny, great dude to be around. I think that was what really interested me.
"Because if Sam and I both have the same sort of 'thing' that we're currently on a journey with, or were born with. We're on sort of opposite sides. We both think we're doing the right thing, for the right reasons. And as the film plays out, you feel for both of them.
"It's hard to say who is exactly wrong and who is exactly right. It's a very grey area, even though we both do questionable things, I would say. So I was really attached and drawn to how this isn't like a normal action film."
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