I should also mention that downloading from torrents or other unauthorized sources is risky and illegal. Advise them to support content creation by using legal methods. Maybe they can download the movie for free if there are free platforms that have proper licensing, but usually, free is only if ads are present, and even then, the quality might be an issue.
In the case of Horrible Bosses 720p Blu‑ray rips, the hidden audio is usually a mix extracted directly from the source disc. Most 720p encoders downmix the original 5.1 to stereo for compatibility, but enthusiasts will often keep the original track as a separate .ac3 or .eac3 file. horriblebosses2011720pblurayhindidualaud link