Not to give too much away but they aren't actually 'buddies' for most of the movie and in fact they dick each other over more than once during the course of the movie, they are more forced together by circumstances and work towards a common goal.
Although you are more bleakly unforgiving than I of modern script writing/acting, this was a cut above the usual schlock, it delivered a believable suspense, and characters you genuinely empathised with.
Being Mark Wahlberg though of course he smirks....
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