Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

[EX Q]: Although there is no disputing the impact that Steven Spielberg's Jurassic Park had when it was released in 1992, there has always been one scene that has bugged/perplexed me.  I speak of the climax, when Alan Grant et al are surrounded by the Velociraptors and about to be pounced upon, when suddenly the T-Rex lunges in and 'saves the day'.  It has already been established earlier on the film that the T-Rex telegraphs its approach with thunderous footsteps, and I'm pretty sure that even if the humans were surrounded by malevolent reptiles, they would notice a huge T-rex squeezing in through the front door of the reception center.  Possible explanations include the T-Rex's ambushing skills (as evident in the earlier Gallimimus chasing scene), the afore-mentioned distraction of the Velociraptors, or even a huge suspension of disbelief to better serve the dynamism of the scene.   I don't like the idea of T-Rex just being shoehorned into the scene to add some va va voom, so is there a better explanation?
[EX A]: Where did the T-Rex come from?

[EX Q]: I have only watched a few episodes of Being Human (the original BBC series) so I may have missed something. (Just got hold of the dvds so trying to catch up.) In episode 3, George transforms into a werewolf after/during fighting Tully in the shed. He exhales a green mist just after the transformation has finished. I didn't notice this in any other episode, did it have something to do with fighting Tully? Eg, proximity of another werewolf?  Any other explanation - maybe just werewolves have very bad breath?
[EX A]: Why does the werewolf exhale a green mist?

[EX Q]: I am confused, what happened at the end of The Grey (2011)? Did Ottway die or did he manage to survive?
[EX A]:
What happened at the end of The Grey?