alex is saying what chaptor 2 is about...

Chaptor 2 is about Arg getting scared  by  Sholk who is Arg best friend. Shlok liked playing practical jokes.
Sholk scared  Arg by making a t-rex sounds then Arg got stuck in quicksand.
Sholk helped him get out.
Then when they were standing there Arg had goosbumps down his furry neck because Sholk was standing next to him and there was a t-rex sound...