It’s when Begbie goes zombie-Begbie and becomes a raging, snarling contagion, spreading the virus in the safe room in what is quite possibly the most terrifyingly claustrophobic sequence ever put on film.
And then immediately after this a certain Stringer Bell therefore decides to shoot them all.
It’s better than its precursor. Much better, and this is despite it getting a bit too silly towards the end. And I have no interest in the undead genre.
Wanderings and ... wonderings. 
I always thought the beginning of this movie is one of the best. When Don chooses to run away and leave his wife… I was speechless. But still, I did understand it all. Most people would have run away like little pussies.
It’s a fabulous movie and I prefer it to the first one.